js iterating 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

// ES6 for-of statement for (const color of colors){ console.log(color); } // Array.prototype.forEach const array = ["one", "two", "three"] array.forEach(function (item, index) { console.log(item, index); }); // Sequential for loop for (var i = 0; i < arrayLength; i++) { console.log(myStringArray[i]); //Do something }

array = [ 1, 2, 3, 4, 5, 6 ]; //set variable//set the stop count // increment each loop for (let i = 0; i < array.length ;i++) { array[i] //iterate through each index. //add the intructions you would like to perform. // add any method to array[ }

const myArray = ["foo","bar"]; // New version myArray.map(item => console.log(item)); //or myArray.forEach(item => console.log(x)); //Older version for(let i = 0; i < myArray.length; i++) { console.log(myArray[i]); }

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