JavaScript BigInt asUintN() Method

The BigInt.asUintN() method is an inbuilt method in JavaScript that is used to wrap a BigInt value to an unsigned integer between 0 and 2^width-1.

Syntax:

BigInt.asUintN (width, bigint);

Parameters: This method accepts two parameters as mentioned above and described below:

• width: This parameter holds the number of bits available for the integer size.
• bigint: This parameter holds the integer to clamp to fit into the supplied bits.

Return value: This method returns the value of bigint modulo 2^width as an unsigned integer.

Below examples illustrate the BigInt.asUintN() method in JavaScript:

Example 1: In this example, we will see the basic use of the BigInt.asUintN() method in JavaScript.

javascript

<script>
    let maxlimit = 2n ** (64n - 1n) - 1n;

    function GFG(num) {
      (num > maxlimit) ?
        console.log("Number exceed the limit "
               + "of signed 64-bit integer!"):
        console.log(BigInt.asUintN(64, num));
    }

    GFG(2n ** 16n);
    GFG(2n ** 32n);
    GFG(2n ** 64n);
</script>

Output:

65536n
4294967296n
"Number exceed the limit of signed 64-bit integer!"

Example 2: In this example, we will see the basic use of the BigInt.asUintN() method in JavaScript.

javascript

<script>
    const max = 2n ** (64n - 1n) - 1n;

    console.log(BigInt.asUintN(64, max));
    console.log(BigInt.asUintN(64, max + 1n));
    console.log(BigInt.asUintN(32, max));
</script>

Output:

9223372036854775807n
9223372036854775808n
4294967295n

Supported Browsers: The browsers supported by BigInt.asUintN() method are listed below:

• Google Chrome 67 and above
• Edge 79 and above
• Firefox 68 and above
• Opera 54 and above
• Safari 14 and above