JavaScript - TypedArray with() Method

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The JavaScript TypedArray with() method is used change the value of a given index. It returns a new typed array with the element at index replaced with the specified value.

This method throws a 'RangeError' exception, if the index parameter value is either less than or greater than the typed array length.

Syntax

Following is the syntax of JavaScript TypedArray with() method −

arrayInstance.with(index, value)

Parameters

  • index − The zero-based index at which the value will be will replaced or changed.

  • value − A value to be insert or assigned at the specified index.

Return value

This method returns a new typed array with the element at specified index replaced with value.

Examples

Example 1

Replace the value of first element (index = 0), with the specified value.

In the following example we are using the JavaScript TypedArray with() method to change (or replace) this typed array [10, 20, 30, 40, 50] element at specified index 0 with the value 10.

<html>
<head>
   <title>JavaScript TypedArray with() Method</title>
</head>
<body>
   <script>
      const T_array = new Uint8Array([10, 20, 30, 40, 50]);
      document.write("Typed array: ", T_array);
      const index = 0;
      const value = 0;
      document.write("<br>Index: ", index);
      document.write("<br>Value: ", value);
      var new_arr = ([]);
      
      //using with() method
      new_arr = T_array.with(index, value);
      document.write("<br>New typed array after replacing value at specified index: ", new_arr);
   </script>
</body>
</html>

Output

Once the above program is executed, it will returns a new typed array after replacing [0, 20, 30, 40, 50].

Typed array: 10,20,30,40,50
Index: 0
Value: 0
New typed array after replacing value at specified index: 0,20,30,40,50

Example 2

The following is another example of the JavaScript TypedArray with() method. We use this method to change (or replace) the value of this typed array [1, 2, 3, 4, 5, 6, 7] at specified index 3 with the given value 10.

<html>
<head>
   <title>JavaScript TypedArray with() Method</title>
</head>
<body>
   <script>
      const T_array = new Uint8Array([1, 2, 3, 4, 5, 6, 7] );
      document.write("Typed array: ", T_array);
      const index = 3;
      const value = 10;
      document.write("<br>Index: ", index);
      document.write("<br>Value: ", value);
      var new_arr = ([]);
      
      //using with() method
      new_arr = T_array.with(index, value);
      document.write("<br>New typed array after replacing value at specified index: ", new_arr);
   </script>
</body>
</html>

Output

The above program returns a new typed array as [1,2,3,10,5,6,7].

Typed array: 1,2,3,4,5,6,7
Index: 3
Value: 10
New typed array after replacing value at specified index: 1,2,3,10,5,6,7

Example 3

If the index parameter value is greater than the typed array length, it will throw a 'RangeError' exception.

<html>
<head>
   <title>JavaScript TypedArray with() Method</title>
</head>
<body>
   <script>
      const T_array = new Uint8Array([10, 20, 30, 40, 50, 60, 70, 80]);
      document.write("Typed array: ", T_array);
      const index = 10;
      const value = 1;
      document.write("<br>Index: ", index);
      document.write("<br>Value: ", value);
      document.write("<br>Typed array length: ", T_array.length);
      const new_arr = ([]);
      
      try {
         new_arr = T_array.with(index, value);
      } catch (error) {
         document.write("<br>", error);
      }
   </script>
</body>
</html>

Output

After executing the above program, it will throw a 'RangeError' exception.

Typed array: 10,20,30,40,50,60,70,80
Index: 10
Value: 1
Typed array length: 8
RangeError: Invalid typed array index
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