XArray.md

XArray

◼ Array.prototype.remove (value)

Removes the first instance of value from the array.

let array = [1, 0, 1];
array.remove(1);
console.log (array); // [0, 1]

◼ _.findBy (array, predicate)

This is sort of a mashup of lodash's _.sortBy and _.filterBy, but optimized for returning only one element instead of reordering the whole array.

predicate is a function that takes an element in parameter, and may return either a number or a boolean :

• when several elements predicate to a number, the function will pick the element with the smallest value to be returned.
• if an element ever predicates to true, it will be returned immediately, without evaluating or comparing remaining elements.
• if an element predicates to false, it will be completely ignored. If all elements predicate to false, the function will return undefined.

let array = [2, 1, 0, -1, -2]
_.findBy(array, n => n); // -2
_.findBy(array, n => n<0); // -1
_.findBy(array, n => n<0 ? false : n); // 0
_.findBy(array, n => n>3); // undefined