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