Last change
on this file since ceaed42 was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago |
initial commit
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[6a3a178] | 1 | var isObject = require('../internals/is-object');
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| 2 | var isSymbol = require('../internals/is-symbol');
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| 3 | var ordinaryToPrimitive = require('../internals/ordinary-to-primitive');
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| 4 | var wellKnownSymbol = require('../internals/well-known-symbol');
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| 5 |
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| 6 | var TO_PRIMITIVE = wellKnownSymbol('toPrimitive');
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| 7 |
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| 8 | // `ToPrimitive` abstract operation
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| 9 | // https://tc39.es/ecma262/#sec-toprimitive
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| 10 | module.exports = function (input, pref) {
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| 11 | if (!isObject(input) || isSymbol(input)) return input;
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| 12 | var exoticToPrim = input[TO_PRIMITIVE];
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| 13 | var result;
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| 14 | if (exoticToPrim !== undefined) {
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| 15 | if (pref === undefined) pref = 'default';
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| 16 | result = exoticToPrim.call(input, pref);
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| 17 | if (!isObject(result) || isSymbol(result)) return result;
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| 18 | throw TypeError("Can't convert object to primitive value");
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| 19 | }
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| 20 | if (pref === undefined) pref = 'number';
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| 21 | return ordinaryToPrimitive(input, pref);
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| 22 | };
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