loop through an array javascript

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
})

View another examples Add Own solution

4.13

Steve McConnell 75 points

                                    array = [ 1, 2, 3, 4, 5, 6 ]; 
for (index = 0; index &lt; array.length; index++) { 
    console.log(array[index]); 
}

Thank you! 8

4.13 (8 Votes)

3.5

Mittenkitten 90 points

                                    var colors = ['red', 'green', 'blue'];
	
	colors.forEach((color, colorIndex) =&gt; {
     console.log(colorIndex + &quot;. &quot; + color); 
    });

Thank you! 6

3.5 (6 Votes)

4.33

Wichita Steve 75 points

                                    var colors = [&quot;red&quot;,&quot;blue&quot;,&quot;green&quot;];<br/>for (var i = 0; i &lt; colors.length; i++) {<br/>    console.log(colors[i]);<br/>}

Thank you! 9

4.33 (9 Votes)

4.22

WhoWantsToKnow 100 points

                                    const myArray = ['foo', 'bar'];

myArray.forEach(x =&gt; console.log(x));

//or

for(let i = 0; i &lt; myArray.length; i++) {
  console.log(myArray[i]);
}

Thank you! 9

4.22 (9 Votes)

Dwight Spencer 105 points

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

// Here's 4 different ways
for (let index = 0; index &lt; 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 value in array
}

array.forEach((value, index) =&gt; {
  console.log(index); // Will log each index
  console.log(value); // Will log each value
});

Thank you! 0

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