If you have a JavaScript array, what is the method to alter the elements in the array using the forEach operator?
If you have a JavaScript array, what is the method to alter the elements in the array using the forEach operator?
Here is a straightforward query, and I'm sharing the response to save time from starting over. The function executed by forEach requires three arguments: the current item, its index within the array, and the array object itself. Therefore, utilizing an arrow function in the format of =>, the resolution appears as follows:
var data = [1,2,3,4];
data.forEach( (item, i, self) => self[i] = item + 10 );
This will yield the outcome:
[11,12,13,14]
The self parameter is not obligatory with the arrow style function, so you can achieve the same result with the following variation:
data.forEach( (item,i) => data[i] = item + 10);
You can also obtain identical results using a traditional function structure, for instance:
data.forEach( function(item, i, self) { self[i] = item + 10; } );
When it comes to replacing array items, a more efficient method is by utilizing the map function:
let numbers = [1, 2, 3, 4];
numbers = numbers.map(element => element * 2);
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