function scanUntilRight(x, ft) // x: an iterable // ft: test function (v, i, x)

const xiterable = require('extra-iterable'); var x = [1, 1, 2, 2, 3, 3, 4, 4]; xiterable.scanUntilRight(x, v => v % 3 === 0); // → 6 ^ xiterable.scanUntilRight(x, v => v % 2 === 0); // → 8 ^ xiterable.scanUntilRight(x, v => v % 6 === 0); // → 0 ^