JavaScript Arrays
JavaScript » JavaScript Arrays

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  Terminology

Array.prototype.forEach(<callbackFn>,<this>) Execute a provided function once per array element.

Array.prototype.map(<callback>) Use a callback function to transform an array into another array.

Array.prototype.reduce(<callbackFn>,<initialValue>) Apply a function against an accumulator and each value of the array (from left-to-right) to reduce it to a single value.

Array.prototype.sort(<comparator()>) Sorts the elements of an array in place using an optional comparator function and returns the array.

Facts, Thoughts and Opinions

Array.prototype.distinct()

An algorithm to extract the distinct values from an array.

var index = {}, distinct = [], i, datum;
 
for (i = 0; i < this.length; i++) {
    datum = this[i]; // modify this as needed
    if (!index[datum]) {
        index[datum] = true;
        distinct.push(datum);
    }
}
 
return distinct;

Select random element from array (JavaScript)

value = myArray[Math.floor(Math.random() * myArray.length)];

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  Sources & Bookmarks

Name/Link Date
JavaScript Array (Mozilla) 2015-03
Javascript Arrays 2014-04-29
page revision: 0, last edited: 01 Dec 2014 20:18
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