Travis build: 1068
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@ -9,6 +9,7 @@ const checkProp = (predicate, prop) => obj => !!predicate(obj[prop]);
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```
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```js
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const lengthIs4 = checkProp(l => l === 4, 'length');
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lengthIs4([]); // false
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lengthIs4([1,2,3,4]); // true
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@ -10,9 +10,9 @@ const dig = (obj, target) =>
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target in obj
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? obj[target]
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: Object.values(obj).reduce((acc, val) => {
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if (acc !== undefined) return acc;
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if (typeof val === 'object') return dig(val, target);
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}, undefined);
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if (acc !== undefined) return acc;
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if (typeof val === 'object') return dig(val, target);
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}, undefined);
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```
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```js
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@ -11,8 +11,8 @@ Throws an exception if `n` is a negative number.
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const factorial = n =>
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n < 0
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? (() => {
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throw new TypeError('Negative numbers are not allowed!');
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})()
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throw new TypeError('Negative numbers are not allowed!');
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})()
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: n <= 1
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? 1
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: n * factorial(n - 1);
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@ -11,14 +11,13 @@ const pipeAsyncFunctions = (...fns) => arg => fns.reduce((p, f) => p.then(f), Pr
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```
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```js
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const sum = pipeAsyncFunctions(
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x => x + 1,
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x => new Promise(resolve => setTimeout(() => resolve(x + 2), 1000)),
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x => x + 3,
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async x => (await x) + 4
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);
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(async() => {
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(async () => {
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console.log(await sum(5)); // 15 (after one second)
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})();
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```
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@ -6,13 +6,12 @@ Use `Array.prototype.filter()` to find array elements that return truthy values
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The `func` is invoked with three arguments (`value, index, array`).
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```js
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const remove = (arr, func) =>
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Array.isArray(arr)
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? arr.filter(func).reduce((acc, val) => {
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arr.splice(arr.indexOf(val), 1);
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return acc.concat(val);
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}, [])
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arr.splice(arr.indexOf(val), 1);
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return acc.concat(val);
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}, [])
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: [];
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```
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