23 lines
848 B
JavaScript
23 lines
848 B
JavaScript
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var $export = require('./_export')
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, toIndex = require('./_to-index')
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, fromCharCode = String.fromCharCode
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, $fromCodePoint = String.fromCodePoint;
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// length should be 1, old FF problem
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$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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, aLen = arguments.length
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, i = 0
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, code;
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while(aLen > i){
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code = +arguments[i++];
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if(toIndex(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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