How function in return statement works?

JavaScript
1

I cant able to understand the following piece of code.what does the third line of code means?

this.subset = function(otherSet) {
    var firstSet = this.values();
    return firstSet.every(function(value) {
        return otherSet.has(value);
    });
};
2

It returns every value from firstSet that is also in otherSet

3

Still dont get it

4

Sorry got it…

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5

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