4 ms·
You need to go something like: module.exports = function leftpad (str, len, ch) { return Array(Math.max(0, len - String(str).length)).join(ch || ' ') + Strin
by chvid 11y ago
You need to go something like:
module.exports = function leftpad (str, len, ch) { return Array(Math.max(0, len - String(str).length)).join(ch || ' ') + String(str); };
Unfortunately we need to wrap str twice so maybe a one-liner is not quite in place.
- gsb 11y agoAlso, this doesn't support zero padding with ch=0.
- vespakoen 11y agoCool, I like the Math.max. Two liner then str = String(str);\n...
- deleted 11y ago[deleted]
- vespakoen 11y agoSo this I guess module.exports = function leftpad (str, len, ch) { str = String(str); if (ch === 0) { ch = '0'; } return Array(Math.max(0, len - str.length)).join(ch || ' ') + str; };
- chvid 11y agoAnd I did not notice the 0 check in the original code either :-D
- vespakoen 11y agoThe array + join is slower http://jsperf.com/leftpadtesting http://jsperf.com/leftpadtesting Repeat + slice is too http://jsperf.com/leftpad http://jsperf.com/leftpad