Finds last value passing a test.
Alternatives: find, findRight, findAll.
Similar: search, scan, find.
This is part of package extra-array.
array.findRight(x, ft);
// x: an array
// ft: test function (v, i, x)const array = require("extra-array");
var x = [1, 2, 3, 4, 5];
array.findRight(x, v => v % 2 == 0);
// 4 ^
array.findRight(x, v => v % 2 == 1);
// 5 ^