Among the Atomic Operations, there is a method Atomics.or() that is used to compute a bitwise OR operation with a given value at a given position in an array. The old value at that position is returned by Atomics.or() function. No other write operation can happen until the modified value is written back.
Syntax:
Atomics.or(typedArray, index, value)
Parameters:
- typedarray: It is the shared integer typed array you want to modify.
- index: It is the position in the typedArray where you want to compute bitwise OR.
- value: It is the number you want to compute the bitwise OR with.
Return Value: Atomics.or() returns the old value at the given position (typedArray[index]).
Examples of the above function are provided below.
Examples:
Input : arr[0] = 9;
Atomics.or(arr, 0, 3);
Output : 9
Input : arr[0] = 3;
Atomics.or(arr, 0, 2);
Output : 3
Examples of the above function are provided below.
Example 1:
Javascript
// creating a SharedArrayBuffer let buf = new SharedArrayBuffer(25); let arr = new Uint8Array(buf); // Initialising element at zeroth position of array with 9 arr[0] = 9; // 9 (1001) OR 3 (0011) = 11 (1011) // Displaying the return value of the Atomics.or() method console.log(Atomics.or(arr, 0, 3)); // Displaying the updated SharedArrayBuffer console.log(Atomics.load(arr, 0)); |
Output:
9 11
Example 2:
Javascript
// creating a SharedArrayBuffer let buf = new SharedArrayBuffer(25); let arr = new Uint8Array(buf); // Initialising element at zeroth position of array with 3 arr[0] = 3; // (0011) AND 2 (0010) = 3 (0011) // Displaying the return value of the Atomics.or() method console.log(Atomics.or(arr, 0, 2)); // Displaying the updated SharedArrayBuffer console.log(Atomics.load(arr, 0)); |
Output:
3 3
Exceptions :
- Throws a TypeError, if typedArray is not one of the allowed integer types.
- Throws a TypeError, if typedArray is not a shared typed array type.
- Throws a RangeError, if the index is out of bounds in the typedArray.
Supported Browser:
- Google Chrome
- Microsoft Edge
- Firefox
- Opera
- Safari
We have a complete list of Javascript Atomic methods, to check those please go through this JavaScript Atomics Complete Reference article.
We have a Cheat Sheet on Javascript where we covered all the important topics of Javascript to check those please go through Javascript Cheat Sheet-A Basic guide to JavaScript.
