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- // https://github.com/tc39/proposal-string-pad-start-end
- var uncurryThis = require('../internals/function-uncurry-this');
- var toLength = require('../internals/to-length');
- var toString = require('../internals/to-string');
- var $repeat = require('../internals/string-repeat');
- var requireObjectCoercible = require('../internals/require-object-coercible');
- var repeat = uncurryThis($repeat);
- var stringSlice = uncurryThis(''.slice);
- var ceil = Math.ceil;
- // `String.prototype.{ padStart, padEnd }` methods implementation
- var createMethod = function (IS_END) {
- return function ($this, maxLength, fillString) {
- var S = toString(requireObjectCoercible($this));
- var intMaxLength = toLength(maxLength);
- var stringLength = S.length;
- var fillStr = fillString === undefined ? ' ' : toString(fillString);
- var fillLen, stringFiller;
- if (intMaxLength <= stringLength || fillStr == '') return S;
- fillLen = intMaxLength - stringLength;
- stringFiller = repeat(fillStr, ceil(fillLen / fillStr.length));
- if (stringFiller.length > fillLen) stringFiller = stringSlice(stringFiller, 0, fillLen);
- return IS_END ? S + stringFiller : stringFiller + S;
- };
- };
- module.exports = {
- // `String.prototype.padStart` method
- // https://tc39.es/ecma262/#sec-string.prototype.padstart
- start: createMethod(false),
- // `String.prototype.padEnd` method
- // https://tc39.es/ecma262/#sec-string.prototype.padend
- end: createMethod(true)
- };
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