mirror of https://github.com/jkjoy/sunpeiwen.git
13 lines
667 B
JavaScript
13 lines
667 B
JavaScript
// 7.1.1 ToPrimitive(input [, PreferredType])
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var isObject = require('./_is-object');
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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 (it, S) {
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if (!isObject(it)) return it;
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var fn, val;
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if (S && typeof (fn = it.toString) == 'function' && !isObject(val = fn.call(it))) return val;
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if (typeof (fn = it.valueOf) == 'function' && !isObject(val = fn.call(it))) return val;
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if (!S && typeof (fn = it.toString) == 'function' && !isObject(val = fn.call(it))) return val;
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throw TypeError("Can't convert object to primitive value");
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};
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