32 lines
1.2 KiB
JavaScript
32 lines
1.2 KiB
JavaScript
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// 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.es/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.es/ecma262/#sec-string.prototype.padend
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end: createMethod(true)
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};
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