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17 lines
620 B
17 lines
620 B
var toInteger = require('./_to-integer'); |
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var defined = require('./_defined'); |
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// true -> String#at |
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// false -> String#codePointAt |
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module.exports = function (TO_STRING) { |
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return function (that, pos) { |
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var s = String(defined(that)); |
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var i = toInteger(pos); |
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var l = s.length; |
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var a, b; |
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if (i < 0 || i >= l) return TO_STRING ? '' : undefined; |
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a = s.charCodeAt(i); |
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return a < 0xd800 || a > 0xdbff || i + 1 === l || (b = s.charCodeAt(i + 1)) < 0xdc00 || b > 0xdfff |
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? TO_STRING ? s.charAt(i) : a |
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: TO_STRING ? s.slice(i, i + 2) : (a - 0xd800 << 10) + (b - 0xdc00) + 0x10000; |
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}; |
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};
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