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