The filter method creates an array filled with all array elements that pass a test provided as a function. Return an array of all the values in the ages array that are a specific number or over:.

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Default parameters - JavaScript | MDN

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javascript optional arguments in function - Stack Overflow

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A function to be run for each element in the array. A value to be passed to the function to be used as its "this" value. If this parameter is empty, the value "undefined" will be passed as its "this" value. An Array containing all the array elements that pass the test. If no elements pass the test it returns an empty array.