1 // https://github.com/tc39/proposal-string-pad-start-end
2 var uncurryThis = require('../internals/function-uncurry-this');
3 var toLength = require('../internals/to-length');
4 var toString = require('../internals/to-string');
5 var $repeat = require('../internals/string-repeat');
6 var requireObjectCoercible = require('../internals/require-object-coercible');
8 var repeat = uncurryThis($repeat);
9 var stringSlice = uncurryThis(''.slice);
12 // `String.prototype.{ padStart, padEnd }` methods implementation
13 var createMethod = function (IS_END) {
14 return function ($this, maxLength, fillString) {
15 var S = toString(requireObjectCoercible($this));
16 var intMaxLength = toLength(maxLength);
17 var stringLength = S.length;
18 var fillStr = fillString === undefined ? ' ' : toString(fillString);
19 var fillLen, stringFiller;
20 if (intMaxLength <= stringLength || fillStr == '') return S;
21 fillLen = intMaxLength - stringLength;
22 stringFiller = repeat(fillStr, ceil(fillLen / fillStr.length));
23 if (stringFiller.length > fillLen) stringFiller = stringSlice(stringFiller, 0, fillLen);
24 return IS_END ? S + stringFiller : stringFiller + S;
29 // `String.prototype.padStart` method
30 // https://tc39.es/ecma262/#sec-string.prototype.padstart
31 start: createMethod(false),
32 // `String.prototype.padEnd` method
33 // https://tc39.es/ecma262/#sec-string.prototype.padend
34 end: createMethod(true)