each method in javascrpt code example

Example 1: javascript foreach

const avengers = ['thor', 'captain america', 'hulk'];
avengers.forEach((item, index)=>{
	console.log(index, item)
})

Example 2: each javascript

function each(collection, action) {
  if (Array.isArray(collection)) {
    for (var i = 0; i < collection.length; i++) {
      action(collection[i], i, collection);
    }
  } else {
    for (var key in collection) {
      action(collection[key], key, collection);
    }
  }
}