How to use JavaScript array iterative method to operate on each array item

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Array.forEach ()

The forEach () method calls the function (callback function) once for each array element.

Example

Var txt = ""

Var numbers = [45, 4, 9, 16, 25]

Numbers.forEach (myFunction)

Function myFunction (value, index, array) {

Txt = txt + value + "

"

}

Note: this function takes three parameters:

Project value

Project index

The array itself

The above example uses only the value parameter. This example can be rewritten as:

Example

Var txt = ""

Var numbers = [45, 4, 9, 16, 25]

Numbers.forEach (myFunction)

Function myFunction (value) {

Txt = txt + value + "

"

}

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