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15 lines
779 B
15 lines
779 B
4 years ago
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var isObject = require('../internals/is-object');
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// `ToPrimitive` abstract operation
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// https://tc39.github.io/ecma262/#sec-toprimitive
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// instead of the ES6 spec version, we didn't implement @@toPrimitive case
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// and the second argument - flag - preferred type is a string
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module.exports = function (input, PREFERRED_STRING) {
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if (!isObject(input)) return input;
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var fn, val;
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if (PREFERRED_STRING && typeof (fn = input.toString) == 'function' && !isObject(val = fn.call(input))) return val;
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if (typeof (fn = input.valueOf) == 'function' && !isObject(val = fn.call(input))) return val;
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if (!PREFERRED_STRING && typeof (fn = input.toString) == 'function' && !isObject(val = fn.call(input))) return val;
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throw TypeError("Can't convert object to primitive value");
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};
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