nodejs iterate over array

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

var arr = [1,2,3,4,5,6,7,8]; // Uses the usual "for" loop to iterate for(var i= 0, l = arr.length; i< l; i++){ console.log(arr[i]); } console.log("========================"); //Uses forEach to iterate arr.forEach(function(item,index){ console.log(item); });

// looping through an array in javascript using our own myEach function // Write an `Array.prototype.myEach(callback)` method that invokes a callback // for every element in an array and returns undefined. Array.prototype.myEach = function(callback) { for (let i = 0 ; i < this.length ; i ++) { callback(this[i]); } } let array = ['Item 1', 'Item 2', 'Item 3', 'Item 4']; array.myEach(function (element) { console.log(element); // this will print each element in the array // Code to do something to each element in the array });

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