How do I pass an extra parameter to the callback function in Javascript .filter() method?

Question

I want to compare each string in an Array with a given string. My current implementation is:

function startsWith(element) {
    return element.indexOf(wordTo         


        

Answer 1

function startsWith(element, wordToCompare) {
    return element.indexOf(wordToCompare) === 0;
}

// ...
var word = "SOMETHING";

addressBook.filter(function(element){
    return startsWith(element, word);
});