Question: What value does a callback function provided to jQuery's grep() method have to return to keep an item in the array and what happens to

What value does a callback function provided to jQuery's grep() method have to return to keep an item in the array and what happens to the value returned by a callback function provided to jQuery's map() method, and what statement would you write inside a callback function provided to jQuery's each() method if you want to simulate a break statement?

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