How to Iterate Through an Array with a For Loop in JavaScript

Iterating through an array is a common programming task. It allows you to access each element of the array and do something with it, such as printing out each element or adding it to a new array. In JavaScript, you can iterate through an array using a for loop.

Steps for Iterating Through an Array with a For Loop

1. Create an array containing the elements you want to iterate over.
2. Set up a for loop block.
3. Set the initial condition for the loop.
4. Set the condition that the loop should end on.
5. Set the increment for each iteration of the loop.
6. Create a variable to store the array elements as the loop runs.
7. Inside the loop body, access the value of the current array element by using the variable you created in the previous step.
8. Do something with the value of the current array element.
9. Close the loop.

Example of Iterating Through an Array with a For Loop

Let’s look at an example of how to iterate through an array with a for loop. We’ll use an array of numbers as an example.

We’ll create an array of numbers and then use a for loop to iterate through the array and print out each number:

[dm_code_snippet background=”yes” background-mobile=”yes” slim=”no” line-numbers=”no” bg-color=”#abb8c3″ theme=”dark” language=”php” wrapped=”no” height=”” copy-text=”Copy Code” copy-confirmed=”Copied”]

let numbers = [1, 2, 3, 4, 5];

for (let i = 0; i < numbers.length; i++) {
  console.log(numbers[i]);
}

[/dm_code_snippet]

In this example, we first create an array of numbers. Then we set up a for loop, with the initial condition set to 0 (we're starting at the first element in the array). We set the condition so that the loop will end when the variable i (which represents the index of the current array element) is equal to the length of the array. We increment the variable i by 1 each time the loop runs. Then, in the loop body, we use the variable i to access the value of the current array element. Finally, we print out the value of the current element.

The output of the code above will be:

[dm_code_snippet background="yes" background-mobile="yes" slim="no" line-numbers="no" bg-color="#abb8c3" theme="dark" language="php" wrapped="no" height="" copy-text="Copy Code" copy-confirmed="Copied"]

1
2
3
4
5

[/dm_code_snippet]

Conclusion

Iterating through an array is a common programming task. In JavaScript, you can iterate through an array using a for loop. Just set up the loop and access each element of the array in the loop body.