/
implementation.js
35 lines (31 loc) · 1.08 KB
/
implementation.js
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
'use strict';
var ToLength = require('es-abstract/2024/ToLength');
var ToString = require('es-abstract/2024/ToString');
var RequireObjectCoercible = require('es-object-atoms/RequireObjectCoercible');
var callBound = require('call-bind/callBound');
var $slice = callBound('String.prototype.slice');
module.exports = function padStart(maxLength) {
var O = RequireObjectCoercible(this);
var S = ToString(O);
var stringLength = ToLength(S.length);
var fillString;
if (arguments.length > 1) {
fillString = arguments[1];
}
var filler = typeof fillString === 'undefined' ? '' : ToString(fillString);
if (filler === '') {
filler = ' ';
}
var intMaxLength = ToLength(maxLength);
if (intMaxLength <= stringLength) {
return S;
}
var fillLen = intMaxLength - stringLength;
while (filler.length < fillLen) {
var fLen = filler.length;
var remainingCodeUnits = fillLen - fLen;
filler += fLen > remainingCodeUnits ? $slice(filler, 0, remainingCodeUnits) : filler;
}
var truncatedStringFiller = filler.length > fillLen ? $slice(filler, 0, fillLen) : filler;
return truncatedStringFiller + S;
};