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chg: refactored String.pad() method with builtin methods

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Tobi Schäfer 2020-03-21 12:03:24 +01:00
parent 708c02f670
commit a0f5729e58
1 changed files with 14 additions and 21 deletions
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35
modules/core/String.js
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@ -410,28 +410,21 @@ String.prototype.md5 = function() {
* String.BALANCE and String.RIGHT here as well.) * String.BALANCE and String.RIGHT here as well.)
* @return String the resulting string * @return String the resulting string
*/ */
String.prototype.pad = function(str, len, mode) { String.prototype.pad = function(str, length, mode) {
if (str == null || len == null) if (mode === null || mode === String.RIGHT) return this.padEnd(length, str);
return this; if (mode === String.LEFT) return this.padStart(length, str);
var diff = len - this.length;
if (diff == 0) if (mode === String.BALANCE && str && length) {
return this; const pos = Math.ceil(this.length / 2);
var left, right = 0; const head = this.substr(0, pos);
if (mode == null || mode == String.RIGHT) const tail = this.substr(pos);
right = diff; const additionalLength = (length - this.length) / 2;
else if (mode == String.LEFT) const startLength = head.length + Math.floor(additionalLength);
left = diff; const endLength = tail.length + Math.ceil(additionalLength);
else if (mode == String.BALANCE) { return head.padStart(startLength, str) + tail.padEnd(endLength, str);
right = Math.round(diff / 2);
left = diff - right;
} }
res.push();
for (var i=0; i<left; i++) return this;
res.write(str);
res.write(this);
for (var i=0; i<right; i++)
res.write(str);
return res.pop();
}; };