comparing two arrays before adding an item from one array to another in JavaScript [closed]

Answer 1

You can use forEach

var addFrom = ["orange", "banana", "watermelon", "lemon", "peach"];
var addTo = ["pear", "tangerine", "grape", "orange", "blueberry"];
var inserted = false;

    addFrom.forEach(function(v,i){
        if(inserted)
           return;

        if(addTo.indexOf(v)<0)
        {
            addTo.push(v);
            inserted = true;
        }
    })