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24 lines
865 B
JavaScript
24 lines
865 B
JavaScript
5 years ago
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var $export = require('./_export');
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var toAbsoluteIndex = require('./_to-absolute-index');
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var fromCharCode = String.fromCharCode;
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var $fromCodePoint = String.fromCodePoint;
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// length should be 1, old FF problem
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$export($export.S + $export.F * (!!$fromCodePoint && $fromCodePoint.length != 1), 'String', {
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// 21.1.2.2 String.fromCodePoint(...codePoints)
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fromCodePoint: function fromCodePoint(x) { // eslint-disable-line no-unused-vars
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var res = [];
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var aLen = arguments.length;
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var i = 0;
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var code;
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while (aLen > i) {
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code = +arguments[i++];
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if (toAbsoluteIndex(code, 0x10ffff) !== code) throw RangeError(code + ' is not a valid code point');
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res.push(code < 0x10000
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? fromCharCode(code)
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: fromCharCode(((code -= 0x10000) >> 10) + 0xd800, code % 0x400 + 0xdc00)
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);
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} return res.join('');
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}
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});
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