When using forEach in JavaScript, the callback function is called with three parameters:
arr.forEach(function callback(currentValue, index, array) {
//your code here
})
In this scenario, both arr and array refer to the same array, with arr being present within the closure of the callback function.
The question arises: what is the purpose of passing array as a parameter to the callback function?
In the scenario where your callback function is defined elsewhere:
function iterateOverValues(value, i, array) {
// ...
}
It may not be aware of the specific array it is intended to operate on:
someArray.forEach(iterateOverValues);
By passing the array as the last argument, the callback function gains access to it.
It is not necessary for the callback to be within the same scope as the forEach function call. In situations like this, the third parameter serves to give the callback a reference to the array.
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