diff --git a/README.md b/README.md index 7248e3af0..abd772b85 100644 --- a/README.md +++ b/README.md @@ -173,7 +173,9 @@ * [`isEven`](#iseven) * [`isPrime`](#isprime) * [`lcm`](#lcm) +* [`maxN`](#maxn) * [`median`](#median) +* [`minN`](#minn) * [`percentile`](#percentile) * [`powerset`](#powerset) * [`primes`](#primes) @@ -288,8 +290,7 @@
View contents -* [`maxN`](#maxn) -* [`minN`](#minn) +* [`geometricProgression`](#geometricprogression)
@@ -3050,6 +3051,31 @@ lcm([1, 3, 4], 5); // 60
[⬆ Back to top](#table-of-contents) +### maxN + +Returns the `n` maximum elements from the provided array. If `n` is greater than or equal to the provided array's length than return the original array(sorted in descending order). + +Sort's the array's shallow copy in descending order and returns the first n elements + +Skip the second argument to get a single element(in the form of a array) +```js +const maxN = (arr, n = 1) => [...arr].sort((a, b) => b - a).slice(0, n); +``` + +
+Examples + +```js +maxN([1, 2, 3]); // [3] +maxN([1, 2, 3], 2); // [3,2] +maxN([1, 2, 3], 4); // [3,2,1] +``` + +
+ +
[⬆ Back to top](#table-of-contents) + + ### median Returns the median of an array of numbers. @@ -3078,6 +3104,30 @@ median([0, 10, -2, 7]); // 3.5
[⬆ Back to top](#table-of-contents) +### minN + +Returns the `n` minimum elements from the provided array. If `n` is greater than or equal to the provided array's length than return the original array(sorted in ascending order). + +Sort's the array's shallow copy in ascending order and returns the first n elements + +Skip the second argument to get a single element(in the form of a array) +```js +const minN = (arr, n = 1) => [...arr].sort((a, b) => a - b).slice(0, n); +``` +
+Examples + +```js +minN([1, 2, 3]); // [1] +minN([1, 2, 3], 2); // [1,2] +minN([1, 2, 3], 4); // [1,2,3] +``` + +
+ +
[⬆ Back to top](#table-of-contents) + + ### percentile Uses the percentile formula to calculate how many numbers in the given array are less or equal to the given value. @@ -5098,40 +5148,27 @@ yesNo('Foo', true); // true --- ## _Uncategorized_ -### maxN +### geometricProgression -Returns the `n` maximum elements from the provided array. If `n` is greater than or equal to the provided array's length than return the original array(sorted in descending order). +Initializes an array containing the numbers in the specified range where `start` and `end` are inclusive and the ratio between two terms is `step`. +Returns an error if `step` equals `1`. -Sort's the array's shallow copy in descending order and returns the first n elements +Use `Array.from()`, `Math.log()` and `Math.floor()` to create an array of the desired length, `Array.map()` to fill with the desired values in a range. +Omit the second argument, `start`, to use a default value of `1`. +Omit the third argument, `step`, to use a default value of `2`. -Skip the second argument to get a single element(in the form of a array) ```js -const maxN = (arr, n = 1) => [...arr].sort((a, b) => b - a).slice(0, n); +const geometricProgression = (end, start = 1, step = 2) => + Array.from({ length: Math.floor(Math.log(end / start) / Math.log(step)) + 1 }).map( + (v, i) => start * step ** i + ); ``` ```js -maxN([1, 2, 3]); // [3] -maxN([1, 2, 3], 2); // [3,2] -maxN([1, 2, 3], 4); // [3,2,1] -``` - -
[⬆ back to top](#table-of-contents) - - -### minN - -Returns the `n` minimum elements from the provided array. If `n` is greater than or equal to the provided array's length than return the original array(sorted in ascending order). - -Sort's the array's shallow copy in ascending order and returns the first n elements - -Skip the second argument to get a single element(in the form of a array) -```js -const minN = (arr, n = 1) => [...arr].sort((a, b) => a - b).slice(0, n); -``` -```js -minN([1, 2, 3]); // [1] -minN([1, 2, 3], 2); // [1,2] -minN([1, 2, 3], 4); // [1,2,3] +geometricProgression(256); // [1, 2, 4, 8, 16, 32, 64, 128, 256] +geometricProgression(256, 3); //[3, 6, 12, 24, 48, 96, 192] +geometricProgression(256, 1, 4); //[1, 4, 16, 64, 256] +geometricProgression(256, 2, 1); //Gives error ```
[⬆ back to top](#table-of-contents) diff --git a/docs/index.html b/docs/index.html index 8effda04f..7c981ee44 100644 --- a/docs/index.html +++ b/docs/index.html @@ -59,7 +59,7 @@ wrapper.appendChild(box); box.appendChild(el); }); - }

 30 seconds of code Curated collection of useful JavaScript snippets that you can understand in 30 seconds or less.

 

Adapter

call

Given a key and a set of arguments, call them when given a context. Primarily useful in composition.

Use a closure to call a stored key with stored arguments.

const call = (key, ...args) => context => context[key](...args);
+    }

 30 seconds of code Curated collection of useful JavaScript snippets that you can understand in 30 seconds or less.

 

Adapter

call

Given a key and a set of arguments, call them when given a context. Primarily useful in composition.

Use a closure to call a stored key with stored arguments.

const call = (key, ...args) => context => context[key](...args);
 
Promise.resolve([1, 2, 3])
   .then(call('map', x => 2 * x))
   .then(console.log); //[ 2, 4, 6 ]
@@ -661,6 +661,10 @@ isPrime(12); // false
 };
 
lcm(12, 7); // 84
 lcm([1, 3, 4], 5); // 60
+

maxN

Returns the n maximum elements from the provided array. If n is greater than or equal to the provided array's length than return the original array(sorted in descending order).

Sort's the array's shallow copy in descending order and returns the first n elements

Skip the second argument to get a single element(in the form of a array)

const maxN = (arr, n = 1) => [...arr].sort((a, b) => b - a).slice(0, n);
+
maxN([1, 2, 3]); // [3]
+maxN([1, 2, 3], 2); // [3,2]
+maxN([1, 2, 3], 4); // [3,2,1]
 

median

Returns the median of an array of numbers.

Find the middle of the array, use Array.sort() to sort the values. Return the number at the midpoint if length is odd, otherwise the average of the two middle numbers.

const median = arr => {
   const mid = Math.floor(arr.length / 2),
     nums = [...arr].sort((a, b) => a - b);
@@ -668,6 +672,10 @@ lcm([1, 3, 4], 5); // 60
 };
 
median([5, 6, 50, 1, -5]); // 5
 median([0, 10, -2, 7]); // 3.5
+

minN

Returns the n minimum elements from the provided array. If n is greater than or equal to the provided array's length than return the original array(sorted in ascending order).

Sort's the array's shallow copy in ascending order and returns the first n elements

Skip the second argument to get a single element(in the form of a array)

const minN = (arr, n = 1) => [...arr].sort((a, b) => a - b).slice(0, n);
+
minN([1, 2, 3]); // [1]
+minN([1, 2, 3], 2); // [1,2]
+minN([1, 2, 3], 4); // [1,2,3]
 

percentile

Uses the percentile formula to calculate how many numbers in the given array are less or equal to the given value.

Use Array.reduce() to calculate how many numbers are below the value and how many are the same value and apply the percentile formula.

const percentile = (arr, val) =>
   100 * arr.reduce((acc, v) => acc + (v < val ? 1 : 0) + (v === val ? 0.5 : 0), 0) / arr.length;
 
percentile([1, 2, 3, 4, 5, 6, 7, 8, 9, 10], 6); // 55
@@ -1152,12 +1160,12 @@ console.log(sdbm('age')); // 808122783
 yesNo('yes'); // true
 yesNo('No'); // false
 yesNo('Foo', true); // true
-

Uncategorized

maxN

Returns the n maximum elements from the provided array. If n is greater than or equal to the provided array's length than return the original array(sorted in descending order).

Sort's the array's shallow copy in descending order and returns the first n elements

Skip the second argument to get a single element(in the form of a array)

const maxN = (arr, n = 1) => [...arr].sort((a, b) => b - a).slice(0, n);
-
maxN([1, 2, 3]); // [3]
-maxN([1, 2, 3], 2); // [3,2]
-maxN([1, 2, 3], 4); // [3,2,1]
-

minN

Returns the n minimum elements from the provided array. If n is greater than or equal to the provided array's length than return the original array(sorted in ascending order).

Sort's the array's shallow copy in ascending order and returns the first n elements

Skip the second argument to get a single element(in the form of a array)

const minN = (arr, n = 1) => [...arr].sort((a, b) => a - b).slice(0, n);
-
minN([1, 2, 3]); // [1]
-minN([1, 2, 3], 2); // [1,2]
-minN([1, 2, 3], 4); // [1,2,3]
+

Uncategorized

geometricProgression

Initializes an array containing the numbers in the specified range where start and end are inclusive and the ratio between two terms is step. Returns an error if step equals 1.

Use Array.from(), Math.log() and Math.floor() to create an array of the desired length, Array.map() to fill with the desired values in a range. Omit the second argument, start, to use a default value of 1. Omit the third argument, step, to use a default value of 2.

const geometricProgression = (end, start = 1, step = 2) =>
+  Array.from({ length: Math.floor(Math.log(end / start) / Math.log(step)) + 1 }).map(
+    (v, i) => start * step ** i
+  );
+
geometricProgression(256); // [1, 2, 4, 8, 16, 32, 64, 128, 256]
+geometricProgression(256, 3); //[3, 6, 12, 24, 48, 96, 192]
+geometricProgression(256, 1, 4); //[1, 4, 16, 64, 256]
+geometricProgression(256, 2, 1); //Gives error
 

\ No newline at end of file diff --git a/snippets/geometricProgression.md b/snippets/geometricProgression.md index c1651a852..3f6c2719b 100644 --- a/snippets/geometricProgression.md +++ b/snippets/geometricProgression.md @@ -7,14 +7,16 @@ Use `Array.from()`, `Math.log()` and `Math.floor()` to create an array of the de Omit the second argument, `start`, to use a default value of `1`. Omit the third argument, `step`, to use a default value of `2`. -``` js -const geometricProgression = (end, start = 1,step = 2) => - Array.from({ length:Math.floor(Math.log(end/start)/Math.log(step))+1}).map((v, i) => start * (step ** (i)) ) +```js +const geometricProgression = (end, start = 1, step = 2) => + Array.from({ length: Math.floor(Math.log(end / start) / Math.log(step)) + 1 }).map( + (v, i) => start * step ** i + ); ``` ```js geometricProgression(256); // [1, 2, 4, 8, 16, 32, 64, 128, 256] -geometricProgression(256,3); //[3, 6, 12, 24, 48, 96, 192] -geometricProgression(256,1,4); //[1, 4, 16, 64, 256] -geometricProgression(256,2,1); //Gives error +geometricProgression(256, 3); //[3, 6, 12, 24, 48, 96, 192] +geometricProgression(256, 1, 4); //[1, 4, 16, 64, 256] +geometricProgression(256, 2, 1); //Gives error ``` diff --git a/tag_database b/tag_database index f47f29880..7b4e92890 100644 --- a/tag_database +++ b/tag_database @@ -49,6 +49,7 @@ flip:adapter fromCamelCase:string functionName:function gcd:math +geometricProgression:uncategorized getDaysDiffBetweenDates:date getScrollPosition:browser getStyle:browser