const array = Ĭonst newArray = array.map(element => x + 2) Like in forEach(), we can pass a second parameter to map() to indicate the value use as this when our callback function is called. In this case, our callback will run with the same three arguments as forEach() with a big difference, now we are going to be able to create a new array with the returns of the callback function. Method map() will create a new array with the results of the callback function call for every value in our array. This is the reason why if we want to do some processing with the data of the array is better to look at a different method like map() or filter(). We have to remember that for Each method return ‘undefined’. const array = Īrray.forEach(element => console.log(element)) We can also pass a second parameter to the forEach() method to use as ‘this’ value when to call our callback function. The first argument is the value of the current index, the second argument is the actual index, and the third parameter is a reference to the array where we are applying the forEach() method. The method will run our callback function with 3 arguments. The method forEach() lets us run a provided function for every element in our array.
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