Keeps values at given indices only. :package: :smiley_cat: :running: :vhs: :moon: :scroll: :newspaper: :blue_book:

Alternatives: filter, filter$, filterAt. Similar: map, filter, reject, reduce, accumulate.

This is part of package extra-array.

This is browserified, minified version of @extra-array/filter-at. It is exported as global variable array_filterAt. CDN: unpkg, jsDelivr.

array.filterAt(x, is);
// x:  an array (updated)
// is: indices (sorted)
// → x

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

var x = [2, 4, 6, 8];
array.filterAt(x, [1, 2]);
// [ 4, 6 ]

array.filterAt(x, [1, 3]);
// [ 4, 8 ]

References

• iterableList.get: Java