Keeps values from left, while a test passes. :package: :smiley_cat: :running: :vhs: :moon: :scroll: :newspaper: :blue_book:

Alternatives: take, takeRight, takeWhile, takeWhileRight. Similar: take, drop.

This is part of package extra-array.

This is browserified, minified version of @extra-array/take-while. It is exported as global variable array_takeWhile. CDN: unpkg, jsDelivr.

array.takeWhile(x, ft);
// x:  an array
// ft: test function (v, i, x)

const array = require("extra-array");

var x = [1, 2, 3, 4, 5];
array.takeWhile(x, v => v < 3);
// [ 1, 2 ]

array.takeWhile(x, v => v < 4);
// [ 1, 2, 3 ]

References

• Data.List.takeWhile: Haskell
• Array.prototype.slice: MDN web docs
• _.takeWhile: lodash