'use strict';
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var getBuiltIn = require('../internals/get-built-in');
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var isCallable = require('../internals/is-callable');
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var isIterable = require('../internals/is-iterable');
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var isObject = require('../internals/is-object');
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var Set = getBuiltIn('Set');
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var isSetLike = function (it) {
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return isObject(it)
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&& typeof it.size == 'number'
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&& isCallable(it.has)
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&& isCallable(it.keys);
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};
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// fallback old -> new set methods proposal arguments
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module.exports = function (it) {
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if (isSetLike(it)) return it;
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return isIterable(it) ? new Set(it) : it;
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};
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