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Dec 14, 2021 · 3 min read · Introduced in ES5, the only difference between Array.prototype.some() and Array.prototype.every() is the following: some() is used to check if at least one of the elements of the array passes the test implemented by the provided function; every() is...
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Dec 13, 2021 · 2 min read · The sort method sorts the elements of an array according to the callback function. For example on an array of numbers: function ascendingOrder(arr) { return arr.sort(function(a, b) { return a - b; }); } ascendingOrder([1, 5, 2, 3, 4]); // =>...
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Dec 13, 2021 · 2 min read · The reduce() method allows for more general forms of array processing, and it's possible to show that both filter and map can be derived as special applications of reduce. The reduce method iterates over each item in an array and returns a single val...
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Dec 13, 2021 · 4 min read · The filter() method creates a new array with all elements that pass the test implemented by the provided function. The filter() method calls a function on each element of an array and returns a new array containing only the elements for which that fu...
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Dec 13, 2021 · 2 min read · The map() method creates a new array populated with the results of calling a provided function on every element in the calling array. Example: let numbers = [1, 4, 9] let roots = numbers.map(function(num) { return Math.sqrt(num) }) // roots is no...
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