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JavaScript - TypedArray map() Method
The JavaScript TypedArray map() method creates a new typed array with the results of calling a function provided by the user on every element in the original typed array.
The map() method operates on a TypedArray (such as Uint8Array, Int16Array, etc.).
It accepts a testing function as a parameter.
The testing function is executed for each element in the TypedArray.
If an element satisfies the condition specified by the testing function (returns a true value).
Syntax
Following is the syntax of JavaScript TypedArray map() method −
map(callbackFn, thisArg)
Parameters
This method accepts two parameters named 'callbackFn' and 'thisArg', which are described below −
callbackFn − This parameter is a testing function that will be executed for each element in the TypedArray.
This function also takes three parameters named 'element', 'index', and 'array'. Here's the description for each parameter −
element − Represents the current element being processed in the TypedArray.
index − Indicates the index (position) of the current element within the TypedArray.
array − Refers to the entire TypedArray.
thisArg (optional) − This is an optional parameter that allows you to specify the value of this within the callbackFn.
Return value
This method returns a new typed array where each element is the output of a callback function.
Examples
Example 1
In the following program, we use the JavaScript TypedArray map() method to create a new typed array with the square roots of the numbers in the original typed array [16, 25, 36, 49]. We pass the Math.sqrt function as an argument to this method, which returns the square root of each element.
<html> <head> <title>JavaScript TypedArray map() Method</title> </head> <body> <script> const T_array = new Uint8Array([16, 25, 36, 49]); document.write("Original typed array: ", T_array); //using map() function let new_arr = ([]); new_arr = T_array.map(Math.sqrt); document.write("<br>New typed array: ", new_arr); </script> </body> </html>
Output
The above program returns a new typed array as −
Original typed array: 16,25,36,49 New typed array: 4,5,6,7
Example 2
The following is another example of the JavaScript TypedArray map() method. We use this method to create a new typed array with three times the value of each element in the original typed array ([1, 2, 3, 4, 5]). We pass an arrow function that multiplies each element by three.
<html> <head> <title>JavaScript TypedArray map() Method</title> </head> <body> <script> const T_array = new Uint8Array([1, 2, 3, 4, 5]); document.write("Original typed array: ", T_array); //using map() function let new_arr = ([]); new_arr = T_array.map((a)=> a * 3); document.write("<br>New typed array: ", new_arr); </script> </body> </html>
Output
After executing the above program, it will return a new typed array −
Original typed array: 1,2,3,4,5 New typed array: 3,6,9,12,15
Example 3
In the example below, the map() method creates a new typed array by executing a provided function to each element in the original typed array ([2, 4, 6, 8, 10]). We create a function named add() that returns the sum of each element with itself, and then we pass this function as an argument to the map() method.
<html> <head> <title>JavaScript TypedArray map() Method</title> </head> <body> <script> function add(element, index, array){ return element += element; } const T_array = new Uint8Array([2, 4, 6, 8, 10]); document.write("Original typed array: ", T_array); //using map() function let new_arr = ([]); new_arr = T_array.map(add); document.write("<br>New typed array: ", new_arr); </script> </body> </html>
Output
After executing the program, a new typed array is returned containing the sum of each element with itself.
Original typed array: 2,4,6,8,10 New typed array: 4,8,12,16,20
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