scanUntilRight

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Subhajit Sahu edited this page Jun 20, 2020 · 12 revisions

Scans from right, until a test passes. 🏃 📼 📦 🌔 📒

Alternatives: scanWhile, scanWhileRight, scanUntil, scanUntilRight.
Similar: search, scan, find.

array.scanUntilRight(x, ft);
// x:  an array
// ft: test function (v, i, x)
// --> first index where test fails till end

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

var x = [1, 1, 2, 2, 3, 3, 4, 4];
array.scanUntilRight(x, v => v % 3 === 0);
// 6                       ^

array.scanUntilRight(x, v => v % 2 === 0);
// 8                            ^

array.scanUntilRight(x, v => v % 6 === 0);
// 0    ^

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