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Programmers like to reduce repetition in their code. The more you repeat your code, the less manageable it is and the slower your programs will run. That is why there are different methods in JavaScript to iterate through datasets.
One of these methods is called the map ()
method. This method iterates through an existing array and performs a specific function on all the elements of that array.
In this guide we will talk about how to use the JavaScript map ()
function. We’ll take a look at three common examples of the map ()
function in action to get you started.
What is the map function ?
The JavaScript map ()
method calls a specific function on each element of an array. The result of this function is then moved into its own table.
For example, suppose you want to multiply each element in an array by two. You can do this by creating a function that multiplies each element in the array by two and moving that function into a map ()
method.
The syntax of the map ()
function is:
function
is the callback function that will be executed on each element of the array. To learn more about functions, you can read our ultimate guide to JavaScript functions. thisValue
is the default value that will be stored in the function’s this
variable. By default, this is not defined.
The map method creates a new array based on the results of the callback function.