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scanWhile
Subhajit Sahu edited this page Jun 15, 2020
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11 revisions
Scans from left, while a test passes. 🏃 📼 📦 🌔 📒
Alternatives: scanWhile, scanWhileRight, scanUntil, scanUntilRight.
Similar: search, scan, find.
iterable.scanWhile(x, fn);
// x: an iterable
// fn: test function (v, i, x)
// --> index where test fails
const iterable = require('extra-iterable');
var x = [1, 1, 2, 2, 3, 3, 4, 4];
iterable.scanWhile(x, v => v % 2 !== 0);
// 2 ^
iterable.scanWhile(x, v => v % 3 !== 0);
// 4 ^
iterable.scanWhile(x, v => v % 6 !== 0);
// 8 ^