JavaScript BigInt() Constructor

The JavaScript BigInt BigInt() Constructor is used to convert any primitive data type or object to a BigInt data type. It returns a new BigInt object that represents the original value. This method is particularly useful when dealing with large numbers that exceed the safe integer limit of 9007199254740991.

Syntax:

BigInt(value);

Parameters: The BigInt() Constructor takes one parameter, which is the value that needs to be converted to a BigInt data type. 

Note: This parameter can be a primitive data type such as a number, string, or boolean, or it can be an object.

Return Value: The BigInt() Constructor returns a new BigInt object that represents the original value passed as a parameter.

Example 1: Fibonacci Sequence with BigInt: In this example, we will create a function to generate the Fibonacci sequence up to a given index using BigInt. We will use the BigInt.bigInt() method to convert numbers to BigInt, as the Fibonacci sequence grows rapidly and exceeds the maximum safe integer size.

// This function calculates the  // Fibonacci sequence up to a  // given number 'n' function fibonacci(n) {  let sequence = [0n, 1n];  for (let i = 2; i <= n; i++) {  sequence[i] = BigInt(sequence[i - 1])  + BigInt(sequence[i - 2]);  }  return sequence; } console.log(fibonacci(10)); 

[ 0n, 1n, 1n, 2n, 3n, 5n, 8n, 13n, 21n, 34n, 55n ] 

Example 2: Calculating Large Factorials with BigInt: In this example, we will create a function to calculate the factorial of a large number using BigInt. We will use the BigInt.bigInt() method to convert numbers to BigInt, as factorials can be very large.

// This function calculates the // Factorial of given number 'n' function factorial(n) {  let result = 1n;  for (let i = 2n; i <= n; i++) {  result *= BigInt(i);  }  return result; } console.log(factorial(30)); 

265252859812191058636308480000000n 

Example 3: Large Number Exponentiation with BigInt: In this example, we will create a function that calculates the value of a large number raised to a large power. We will use the BigInt.bigInt() method to convert numbers to BigInt, as both the base and exponent can be very large.

// This function calculates the Power // of given base and exponent function power(base, exponent) {  let result = 1n;  for (let i = 0n; i < exponent; i++) {  result *= BigInt(base);  }  return result; } console.log(power("123456789", 10)); 

822526259147102579504761143661535547764137892295514168093701699676416207799736601n 

Supported Browsers:

• Chrome 67.0
• Edge 79.0
• Firefox 68.0
• Opera 54.0 
• Safari 14.0