how to iterate array of big length with steps in javascript code example

Example 1: javascript loop through array

let array = ['Item 1', 'Item 2', 'Item 3'];

for (let item of array) {
  console.log(item);
}

Example 2: loop through array javascript

/* ES6 */
const cities = ["Chicago", "New York", "Los Angeles"];
cities.map(city => {
	console.log(city)
})