What are the differences between JavaScript's push() and concat() methods?

Rashid D

In JavaScript, both thepush() andconcat() methods are used to combine arrays or add elements to an array, but they have some key differences. Let's explore these differences: 1. Array Modification: -push(): - Thepush() method modifies the original array by adding one or more elements to the end. - It mutates the array in place and returns the new length of the array. -concat(): - Theconcat() method does not modify the original array. - Instead, it returns a new array that combines the elements of the original array with additional elements or arrays provided as arguments. 2. Usage: -push(): - Thepush() method is commonly used when you want to add one or more elements to the end of an existing array. - It is particularly useful when you want to append elements to an array and don't need a new array as the result. -concat(): - Theconcat() method is used when you want to create a new array by combining multiple arrays or adding elements to an existing array. - It allows you to concatenate arrays and values, creating a new array without modifying the original arrays. 3. Arguments: -push(): - Thepush() method takes one or more elements as arguments and adds them to the end of the array. - It appends the provided elements in the order they are provided. -concat(): - Theconcat() method takes one or more arrays or values as arguments. - It creates a new array by combining the elements of the original array with the additional arrays or values. - If an argument is an array, its elements are individually added to the new array. - If an argument is a value (not an array), it is appended as a single element to the new array. 4. Return Value: -push(): - Thepush() method returns the new length of the modified array. - It can be useful if you want to track the length of the array after adding elements. -concat(): - Theconcat() method returns a new array that contains the combined elements. - It allows you to create a new array without modifying the original arrays. Consider the specific requirements of your use case when choosing betweenpush() andconcat(). If you need to add elements to an existing array and modify it in place,push() is suitable. If you want to combine arrays or create a new array without modifying the original arrays,concat() is the preferred option.