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namnv609/string-padding.js

Created July 10, 2020 08:55
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Simple string padding for JS (like Ruby ljust and rjust)
Raw
string-padding.js
String.prototype.rJust = function(padLen, padStr) {
return (new Array(padLen).join(padStr) + this.valueOf()).slice(-padLen);
};
String.prototype.lJust = function(padLen, padStr) {
return (this.valueOf() + new Array(padLen).join(padStr)).substring(0, padLen);
};
/**
* > "6969".lJust(10, "0")
* < "6969000000"
* > "6969".rJust(10, "0")
* < "0000006969"
*/
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