8 Methods for Iterating Through an Array

TLDRLearn eight methods for iterating through an array in JavaScript, including forEach, map, filter, reduce, some, every, find, and findIndex.

Key insights

forEach: Executes a specified function for each item in the array.

🔄map: Creates a new array by applying a function to each item in the original array.

🔎filter: Creates a new array with all the elements that pass a specific condition.

reduce: Applies a function to reduce the array to a single value.

⚖️some: Checks if at least one item in the array satisfies a condition.

Q&A

What is the forEach method?

The forEach method executes a specified function for each item in the array.

How does the map method work?

The map method creates a new array by applying a function to each item in the original array.

What is the purpose of the filter method?

The filter method creates a new array with all the elements that pass a specific condition.

What does the reduce method do?

The reduce method applies a function to reduce the array to a single value.

What is the some method used for?

The some method checks if at least one item in the array satisfies a condition.

Timestamped Summary

00:00Array iteration refers to going through each item in an array and performing some operation.

00:02There are eight methods for iterating through an array: forEach, map, filter, reduce, some, every, find, and findIndex.

00:12The forEach method executes a specified function for each item in the array.

00:25The map method creates a new array by applying a function to each item in the original array.

01:31The filter method creates a new array with all the elements that pass a specific condition.

02:30The reduce method applies a function to reduce the array to a single value.

03:40The some method checks if at least one item in the array satisfies a condition.

05:31The find method searches for a specific item in the array and returns it.