Answers for "$each array"

jquery loop through array

var arr = ['one','two','three','four','five'];
$.each(arr, function(index, value){
	console.log('The value at arr[' + index + '] is: ' + value);
});

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.