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30secondsofcode
2018-12-12 22:06:03 +00:00
parent ee0d23d302
commit dbc56ed9f4
8 changed files with 50 additions and 23 deletions
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20
README.md
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@ -664,13 +664,14 @@ const pipeAsyncFunctions = (...fns) => arg => fns.reduce((p, f) => p.then(f), Pr
<summary>Examples</summary>
```js
const sum = pipeAsyncFunctions(
x => x + 1,
x => new Promise(resolve => setTimeout(() => resolve(x + 2), 1000)),
x => x + 3,
async x => (await x) + 4
);
(async () => {
(async() => {
console.log(await sum(5)); // 15 (after one second)
})();
```
@ -2312,12 +2313,13 @@ Use `Array.prototype.filter()` to find array elements that return truthy values
The `func` is invoked with three arguments (`value, index, array`).
```js
const remove = (arr, func) =>
Array.isArray(arr)
? arr.filter(func).reduce((acc, val) => {
arr.splice(arr.indexOf(val), 1);
return acc.concat(val);
}, [])
arr.splice(arr.indexOf(val), 1);
return acc.concat(val);
}, [])
: [];
```
@ -4616,7 +4618,11 @@ Loop through an array of functions containing asynchronous events, calling `next
```js
const chainAsync = fns => {
let curr = 0;
const next = () => fns[curr++](next);
const last = fns[fns.length - 1];
const next = () => {
const fn = fns[curr++];
fn === last ? fn() : fn(next);
};
next();
};
```
@ -4632,6 +4638,10 @@ chainAsync([
},
next => {
console.log('1 second');
setTimeout(next, 1000);
},
() => {
console.log('2 second');
}
]);
```

5
docs/adapter.html
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@ -125,13 +125,14 @@ Object<span class="token punctuation">.</span><span class="token function">assig
<span class="token keyword">const</span> fn <span class="token operator">=</span> <span class="token function">overArgs</span><span class="token punctuation">((</span>x<span class="token punctuation">,</span> y<span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token punctuation">[</span>x<span class="token punctuation">,</span> y<span class="token punctuation">], [</span>square<span class="token punctuation">,</span> double<span class="token punctuation">]);</span>
<span class="token function">fn</span><span class="token punctuation">(</span><span class="token number">9</span><span class="token punctuation">,</span> <span class="token number">3</span><span class="token punctuation">);</span> <span class="token comment">// [81, 6]</span>
</pre></div><div class="card code-card"><div class="corner intermediate"></div><div class="section card-content"><h4 id="pipeasyncfunctions">pipeAsyncFunctions</h4><p>Performs left-to-right function composition for asynchronous functions.</p><p>Use <code>Array.prototype.reduce()</code> with the spread operator (<code>...</code>) to perform left-to-right function composition using <code>Promise.then()</code>. The functions can return a combination of: simple values, <code>Promise</code>'s, or they can be defined as <code>async</code> ones returning through <code>await</code>. All functions must be unary.</p></div><div class="copy-button-container"><button class="copy-button" aria-label="Copy to clipboard"></button></div><pre class="section card-code language-js"><span class="token keyword">const</span> <span class="token function-variable function">pipeAsyncFunctions</span> <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token operator">...</span>fns<span class="token punctuation">)</span> <span class="token operator">=></span> arg <span class="token operator">=></span> fns<span class="token punctuation">.</span><span class="token function">reduce</span><span class="token punctuation">((</span>p<span class="token punctuation">,</span> f<span class="token punctuation">)</span> <span class="token operator">=></span> p<span class="token punctuation">.</span><span class="token function">then</span><span class="token punctuation">(</span>f<span class="token punctuation">),</span> Promise<span class="token punctuation">.</span><span class="token function">resolve</span><span class="token punctuation">(</span>arg<span class="token punctuation">));</span>
</pre><label class="collapse">examples</label><pre class="section card-examples language-js"><span class="token keyword">const</span> sum <span class="token operator">=</span> <span class="token function">pipeAsyncFunctions</span><span class="token punctuation">(</span>
</pre><label class="collapse">examples</label><pre class="section card-examples language-js">
<span class="token keyword">const</span> sum <span class="token operator">=</span> <span class="token function">pipeAsyncFunctions</span><span class="token punctuation">(</span>
x <span class="token operator">=></span> x <span class="token operator">+</span> <span class="token number">1</span><span class="token punctuation">,</span>
x <span class="token operator">=></span> <span class="token keyword">new</span> <span class="token class-name">Promise</span><span class="token punctuation">(</span>resolve <span class="token operator">=></span> <span class="token function">setTimeout</span><span class="token punctuation">(()</span> <span class="token operator">=></span> <span class="token function">resolve</span><span class="token punctuation">(</span>x <span class="token operator">+</span> <span class="token number">2</span><span class="token punctuation">),</span> <span class="token number">1000</span><span class="token punctuation">)),</span>
x <span class="token operator">=></span> x <span class="token operator">+</span> <span class="token number">3</span><span class="token punctuation">,</span>
<span class="token keyword">async</span> x <span class="token operator">=></span> <span class="token punctuation">(</span><span class="token keyword">await</span> x<span class="token punctuation">)</span> <span class="token operator">+</span> <span class="token number">4</span>
<span class="token punctuation">);
(</span><span class="token keyword">async</span> <span class="token punctuation">()</span> <span class="token operator">=></span> <span class="token punctuation">{</span>
(</span><span class="token keyword">async</span><span class="token punctuation">()</span> <span class="token operator">=></span> <span class="token punctuation">{</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token keyword">await</span> <span class="token function">sum</span><span class="token punctuation">(</span><span class="token number">5</span><span class="token punctuation">));</span> <span class="token comment">// 15 (after one second)</span>
<span class="token punctuation">})();</span>
</pre></div><div class="card code-card"><div class="corner intermediate"></div><div class="section card-content"><h4 id="pipefunctions">pipeFunctions</h4><p>Performs left-to-right function composition.</p><p>Use <code>Array.prototype.reduce()</code> with the spread operator (<code>...</code>) to perform left-to-right function composition. The first (leftmost) function can accept one or more arguments; the remaining functions must be unary.</p></div><div class="copy-button-container"><button class="copy-button" aria-label="Copy to clipboard"></button></div><pre class="section card-code language-js"><span class="token keyword">const</span> <span class="token function-variable function">pipeFunctions</span> <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token operator">...</span>fns<span class="token punctuation">)</span> <span class="token operator">=></span> fns<span class="token punctuation">.</span><span class="token function">reduce</span><span class="token punctuation">((</span>f<span class="token punctuation">,</span> g<span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token punctuation">(</span><span class="token operator">...</span>args<span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token function">g</span><span class="token punctuation">(</span><span class="token function">f</span><span class="token punctuation">(</span><span class="token operator">...</span>args<span class="token punctuation">)));</span>

12
docs/function.html
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@ -121,7 +121,11 @@ console<span class="token punctuation">.</span><span class="token function">log<
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token function">freddyBound</span><span class="token punctuation">(</span><span class="token string">'hi'</span><span class="token punctuation">,</span> <span class="token string">'!'</span><span class="token punctuation">));</span> <span class="token comment">// 'hi fred!'</span>
</pre></div><div class="card code-card"><div class="corner intermediate"></div><div class="section card-content"><h4 id="chainasync">chainAsync</h4><p>Chains asynchronous functions.</p><p>Loop through an array of functions containing asynchronous events, calling <code>next</code> when each asynchronous event has completed.</p></div><div class="copy-button-container"><button class="copy-button" aria-label="Copy to clipboard"></button></div><pre class="section card-code language-js"><span class="token keyword">const</span> <span class="token function-variable function">chainAsync</span> <span class="token operator">=</span> fns <span class="token operator">=></span> <span class="token punctuation">{</span>
<span class="token keyword">let</span> curr <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span>
<span class="token keyword">const</span> <span class="token function-variable function">next</span> <span class="token operator">=</span> <span class="token punctuation">()</span> <span class="token operator">=></span> fns<span class="token punctuation">[</span>curr<span class="token operator">++</span><span class="token punctuation">](</span>next<span class="token punctuation">);</span>
<span class="token keyword">const</span> last <span class="token operator">=</span> fns<span class="token punctuation">[</span>fns<span class="token punctuation">.</span>length <span class="token operator">-</span> <span class="token number">1</span><span class="token punctuation">];</span>
<span class="token keyword">const</span> <span class="token function-variable function">next</span> <span class="token operator">=</span> <span class="token punctuation">()</span> <span class="token operator">=></span> <span class="token punctuation">{</span>
<span class="token keyword">const</span> fn <span class="token operator">=</span> fns<span class="token punctuation">[</span>curr<span class="token operator">++</span><span class="token punctuation">];</span>
fn <span class="token operator">===</span> last <span class="token operator">?</span> <span class="token function">fn</span><span class="token punctuation">() :</span> <span class="token function">fn</span><span class="token punctuation">(</span>next<span class="token punctuation">);
};</span>
<span class="token function">next</span><span class="token punctuation">();
};</span>
</pre><label class="collapse">examples</label><pre class="section card-examples language-js"><span class="token function">chainAsync</span><span class="token punctuation">([</span>
@ -130,7 +134,11 @@ console<span class="token punctuation">.</span><span class="token function">log<
<span class="token function">setTimeout</span><span class="token punctuation">(</span>next<span class="token punctuation">,</span> <span class="token number">1000</span><span class="token punctuation">);
},</span>
next <span class="token operator">=></span> <span class="token punctuation">{</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token string">'1 second'</span><span class="token punctuation">);
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token string">'1 second'</span><span class="token punctuation">);</span>
<span class="token function">setTimeout</span><span class="token punctuation">(</span>next<span class="token punctuation">,</span> <span class="token number">1000</span><span class="token punctuation">);
},
()</span> <span class="token operator">=></span> <span class="token punctuation">{</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token string">'2 second'</span><span class="token punctuation">);
}
]);</span>
</pre></div><div class="card code-card"><div class="corner intermediate"></div><div class="section card-content"><h4 id="compose">compose</h4><p>Performs right-to-left function composition.</p><p>Use <code>Array.prototype.reduce()</code> to perform right-to-left function composition. The last (rightmost) function can accept one or more arguments; the remaining functions must be unary.</p></div><div class="copy-button-container"><button class="copy-button" aria-label="Copy to clipboard"></button></div><pre class="section card-code language-js"><span class="token keyword">const</span> <span class="token function-variable function">compose</span> <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token operator">...</span>fns<span class="token punctuation">)</span> <span class="token operator">=></span> fns<span class="token punctuation">.</span><span class="token function">reduce</span><span class="token punctuation">((</span>f<span class="token punctuation">,</span> g<span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token punctuation">(</span><span class="token operator">...</span>args<span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token function">f</span><span class="token punctuation">(</span><span class="token function">g</span><span class="token punctuation">(</span><span class="token operator">...</span>args<span class="token punctuation">)));</span>

9
docs/index.html
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@ -405,12 +405,13 @@
</pre></div><div class="card code-card"><div class="corner beginner"></div><div class="section card-content"><h4 id="reject">reject</h4><p>Takes a predicate and array, like <code>Array.prototype.filter()</code>, but only keeps <code>x</code> if <code>pred(x) === false</code>.</p></div><div class="copy-button-container"><button class="copy-button" aria-label="Copy to clipboard"></button></div><pre class="section card-code language-js"><span class="token keyword">const</span> <span class="token function-variable function">reject</span> <span class="token operator">=</span> <span class="token punctuation">(</span>pred<span class="token punctuation">,</span> array<span class="token punctuation">)</span> <span class="token operator">=></span> array<span class="token punctuation">.</span><span class="token function">filter</span><span class="token punctuation">((</span><span class="token operator">...</span>args<span class="token punctuation">)</span> <span class="token operator">=> !</span><span class="token function">pred</span><span class="token punctuation">(</span><span class="token operator">...</span>args<span class="token punctuation">));</span>
</pre><label class="collapse">examples</label><pre class="section card-examples language-js"><span class="token function">reject</span><span class="token punctuation">(</span>x <span class="token operator">=></span> x <span class="token operator">%</span> <span class="token number">2</span> <span class="token operator">===</span> <span class="token number">0</span><span class="token punctuation">, [</span><span class="token number">1</span><span class="token punctuation">,</span> <span class="token number">2</span><span class="token punctuation">,</span> <span class="token number">3</span><span class="token punctuation">,</span> <span class="token number">4</span><span class="token punctuation">,</span> <span class="token number">5</span><span class="token punctuation">]);</span> <span class="token comment">// [1, 3, 5]</span>
<span class="token function">reject</span><span class="token punctuation">(</span>word <span class="token operator">=></span> word<span class="token punctuation">.</span>length <span class="token operator">></span> <span class="token number">4</span><span class="token punctuation">, [</span><span class="token string">'Apple'</span><span class="token punctuation">,</span> <span class="token string">'Pear'</span><span class="token punctuation">,</span> <span class="token string">'Kiwi'</span><span class="token punctuation">,</span> <span class="token string">'Banana'</span><span class="token punctuation">]);</span> <span class="token comment">// ['Pear', 'Kiwi']</span>
</pre></div><div class="card code-card"><div class="corner intermediate"></div><div class="section card-content"><h4 id="remove">remove</h4><p>Removes elements from an array for which the given function returns <code>false</code>.</p><p>Use <code>Array.prototype.filter()</code> to find array elements that return truthy values and <code>Array.prototype.reduce()</code> to remove elements using <code>Array.prototype.splice()</code>. The <code>func</code> is invoked with three arguments (<code>value, index, array</code>).</p></div><div class="copy-button-container"><button class="copy-button" aria-label="Copy to clipboard"></button></div><pre class="section card-code language-js"><span class="token keyword">const</span> <span class="token function-variable function">remove</span> <span class="token operator">=</span> <span class="token punctuation">(</span>arr<span class="token punctuation">,</span> func<span class="token punctuation">)</span> <span class="token operator">=></span>
</pre></div><div class="card code-card"><div class="corner intermediate"></div><div class="section card-content"><h4 id="remove">remove</h4><p>Removes elements from an array for which the given function returns <code>false</code>.</p><p>Use <code>Array.prototype.filter()</code> to find array elements that return truthy values and <code>Array.prototype.reduce()</code> to remove elements using <code>Array.prototype.splice()</code>. The <code>func</code> is invoked with three arguments (<code>value, index, array</code>).</p></div><div class="copy-button-container"><button class="copy-button" aria-label="Copy to clipboard"></button></div><pre class="section card-code language-js">
<span class="token keyword">const</span> <span class="token function-variable function">remove</span> <span class="token operator">=</span> <span class="token punctuation">(</span>arr<span class="token punctuation">,</span> func<span class="token punctuation">)</span> <span class="token operator">=></span>
Array<span class="token punctuation">.</span><span class="token function">isArray</span><span class="token punctuation">(</span>arr<span class="token punctuation">)</span>
<span class="token operator">?</span> arr<span class="token punctuation">.</span><span class="token function">filter</span><span class="token punctuation">(</span>func<span class="token punctuation">).</span><span class="token function">reduce</span><span class="token punctuation">((</span>acc<span class="token punctuation">,</span> val<span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token punctuation">{</span>
arr<span class="token punctuation">.</span><span class="token function">splice</span><span class="token punctuation">(</span>arr<span class="token punctuation">.</span><span class="token function">indexOf</span><span class="token punctuation">(</span>val<span class="token punctuation">),</span> <span class="token number">1</span><span class="token punctuation">);</span>
<span class="token keyword">return</span> acc<span class="token punctuation">.</span><span class="token function">concat</span><span class="token punctuation">(</span>val<span class="token punctuation">);
}, [])
arr<span class="token punctuation">.</span><span class="token function">splice</span><span class="token punctuation">(</span>arr<span class="token punctuation">.</span><span class="token function">indexOf</span><span class="token punctuation">(</span>val<span class="token punctuation">),</span> <span class="token number">1</span><span class="token punctuation">);</span>
<span class="token keyword">return</span> acc<span class="token punctuation">.</span><span class="token function">concat</span><span class="token punctuation">(</span>val<span class="token punctuation">);
}, [])
: [];</span>
</pre><label class="collapse">examples</label><pre class="section card-examples language-js"><span class="token function">remove</span><span class="token punctuation">([</span><span class="token number">1</span><span class="token punctuation">,</span> <span class="token number">2</span><span class="token punctuation">,</span> <span class="token number">3</span><span class="token punctuation">,</span> <span class="token number">4</span><span class="token punctuation">],</span> n <span class="token operator">=></span> n <span class="token operator">%</span> <span class="token number">2</span> <span class="token operator">===</span> <span class="token number">0</span><span class="token punctuation">);</span> <span class="token comment">// [2, 4]</span>
</pre></div><div class="card code-card"><div class="corner beginner"></div><div class="section card-content"><h4 id="sample">sample</h4><p>Returns a random element from an array.</p><p>Use <code>Math.random()</code> to generate a random number, multiply it by <code>length</code> and round it off to the nearest whole number using <code>Math.floor()</code>. This method also works with strings.</p></div><div class="copy-button-container"><button class="copy-button" aria-label="Copy to clipboard"></button></div><pre class="section card-code language-js"><span class="token keyword">const</span> <span class="token function-variable function">sample</span> <span class="token operator">=</span> arr <span class="token operator">=></span> arr<span class="token punctuation">[</span>Math<span class="token punctuation">.</span><span class="token function">floor</span><span class="token punctuation">(</span>Math<span class="token punctuation">.</span><span class="token function">random</span><span class="token punctuation">()</span> <span class="token operator">*</span> arr<span class="token punctuation">.</span>length<span class="token punctuation">)];</span>

4
snippets/chainAsync.md
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@ -9,9 +9,9 @@ const chainAsync = fns => {
let curr = 0;
const last = fns[fns.length - 1];
const next = () => {
const fn = fns[curr++]
const fn = fns[curr++];
fn === last ? fn() : fn(next);
}
};
next();
};
```

3
snippets/pipeAsyncFunctions.md
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@ -11,13 +11,14 @@ const pipeAsyncFunctions = (...fns) => arg => fns.reduce((p, f) => p.then(f), Pr
```
```js
const sum = pipeAsyncFunctions(
x => x + 1,
x => new Promise(resolve => setTimeout(() => resolve(x + 2), 1000)),
x => x + 3,
async x => (await x) + 4
);
(async () => {
(async() => {
console.log(await sum(5)); // 15 (after one second)
})();
```

7
snippets/remove.md
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@ -6,12 +6,13 @@ Use `Array.prototype.filter()` to find array elements that return truthy values
The `func` is invoked with three arguments (`value, index, array`).
```js
const remove = (arr, func) =>
Array.isArray(arr)
? arr.filter(func).reduce((acc, val) => {
arr.splice(arr.indexOf(val), 1);
return acc.concat(val);
}, [])
arr.splice(arr.indexOf(val), 1);
return acc.concat(val);
}, [])
: [];
```

13
test/_30s.js
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@ -110,7 +110,11 @@ const capitalizeEveryWord = str => str.replace(/\b[a-z]/g, char => char.toUpperC
const castArray = val => (Array.isArray(val) ? val : [val]);
const chainAsync = fns => {
let curr = 0;
const next = () => fns[curr++](next);
const last = fns[fns.length - 1];
const next = () => {
const fn = fns[curr++];
fn === last ? fn() : fn(next);
};
next();
};
const chunk = (arr, size) =>
@ -974,12 +978,13 @@ const reducedFilter = (data, keys, fn) =>
}, {})
);
const reject = (pred, array) => array.filter((...args) => !pred(...args));
const remove = (arr, func) =>
Array.isArray(arr)
? arr.filter(func).reduce((acc, val) => {
arr.splice(arr.indexOf(val), 1);
return acc.concat(val);
}, [])
arr.splice(arr.indexOf(val), 1);
return acc.concat(val);
}, [])
: [];
const removeNonASCII = str => str.replace(/[^\x20-\x7E]/g, '');
const renameKeys = (keysMap, obj) =>