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Code Block
let sum = 0;
const numbers = [ 65, 44, 12, 4 ];

numbers.forEach( function(itemv) {
	sum += itemv;
});


Example 2) Compute the sum:

Code Block
let sum = 0;
const numbers = [ 65, 44, 12, 4 ];

numbers.forEach( myFunction);

function myFunction(itemv)
{
	sum += itemv;
}


Example 3) Multiple each element:

Code Block
let sum = 0;
const numbers = [ 65, 44, 12, 4 ];

numbers.forEach( function(itemv, idx, arr) {
	arr[idx] = itemv * 10;
});