Arrays come with a useful forEach function that allows you to loop through the array.

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var colors = ['red', 'blue', 'green'];

colors.forEach(function(color) {
  console.log(color);
});

// red
// blue
// green

You can also get the index in each loop as follows:

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const colors = ['red', 'blue', 'green'];

colors.forEach((item, index)=>{
  console.log(index, item)
});

// 0 'red'
// 1 'blue'
// 2 'green'