JavaScript’s Array#forEach() function is one of several ways to iterate through a JavaScript array. It is generally considered one of the “functional programming” methods along with filter(), map(), and reduce().

Getting Started

The forEach() method takes a parameter callback, which is a function that JavaScript will execute on every element in the array.

// Prints "a", "b", "c"
['a', 'b', 'c'].forEach(v => {
  console.log(v);
});

JavaScript calls your callback with 3 parameters: currentValue, index, and array. The index parameter is how you get the current array index with forEach().

// Prints "0: a, 1: b, 2: c"
['a', 'b', 'c'].forEach(function callback(value, index) {
  console.log(`${index}: ${value}`);
});

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