iterate over array js

javascript loop through array

var data = [1, 2, 3, 4, 5, 6];

// traditional for loop
for(let i=0; i<=data.length; i++) {
  console.log(data[i])  // 1 2 3 4 5 6
}

// using for...of
for(let i of data) {
	console.log(i) // 1 2 3 4 5 6
}

// using for...in
for(let i in data) {
  	console.log(i) // Prints indices for array elements
	console.log(data[i]) // 1 2 3 4 5 6
}

// using forEach
data.forEach((i) => {
  console.log(i) // 1 2 3 4 5 6
})
// NOTE ->  forEach method is about 95% slower than the traditional for loop

// using map
data.map((i) => {
  console.log(i) // 1 2 3 4 5 6
})

Posted by: Guest on December-18-2020

let array = ['Item 1', 'Item 2', 'Item 3']; // Here's 4 different ways for (let index = 0; index < array.length; index++) { console.log(array[index]); } for (let index in array) { console.log(array[index]); } for (let value of array) { console.log(value); // Will log each value } array.forEach((value, index) => { console.log(index); // Will log each index console.log(value); // Will log each value });

let my_array = [1, 2, 3, 4, 5]; // standard for loop for(let i = 0; i < my_array.length; i++) { console.log(my_array[i]) // 1 2 3 4 5 6 } // for and of method for(let i of my_array) { console.log(i) } /* Results: 1 2 3 4 5 1 2 3 4 5 (From both methods) */

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