takeWhile - nodef/extra-array GitHub Wiki
Keep values from left, while a test passes.
Alternatives: take, takeRight, takeWhile, takeWhileRight. Similar: take, drop.
function takeWhile(x, ft)
// x: an array
// ft: test function (v, i, x)
const xarray = require('extra-array');
var x = [1, 2, 3, 4, 5];
xarray.takeWhile(x, v => v < 3);
// → [ 1, 2 ]
xarray.takeWhile(x, v => v < 4);
// → [ 1, 2, 3 ]