search - nodef/extra-object GitHub Wiki

Find key of an entry passing a test.

Similar: search, searchAll. Similar: find, search, searchValue.

function search(x, ft)
// x:  an object
// ft: test function (v, k, x)

const object = require('extra-object');

var x = {a: 1, b: 2, c: 3, d: 2};
object.search(x, v => v === 2);
// → 'b'         ^

object.search(x, v => v === 4);
// → null

References