for each loop index code example

Example 1: forEach index

const array1 = ['a', 'b', 'c'];

array1.forEach((element, index) => console.log(element, index));

Example 2: forEach

const arraySparse = [1,3,,7]
let numCallbackRuns = 0

arraySparse.forEach((element) => {
  console.log(element)
  numCallbackRuns++
})

console.log("numCallbackRuns: ", numCallbackRuns)

// 1
// 3
// 7
// numCallbackRuns: 3
// comment: as you can see the missing value between 3 and 7 didn't invoke callback function.

Example 3: javascript foreach call specific value in array

run.addEventListener("click", function () {
    people.forEach((element) => console.log(element.firstname));
  }); // select a specific string in array

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Ruby Example

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