JavaScript Numbers

JavaScript represents numbers as floating-point values, which can be integers or decimals.

let intNum = 5;

let floatNum = 3.14;

BigInt is a data type that handles very large integers beyond the Number range. Use an n at the end to create a BigInt:

let bigNum = 123456789012345678901234567890n;

JavaScript provides several methods to manipulate numbers:

1. toString() – Converts the number to a string.

let num = 123;

console.log(num.toString()); // Outputs: “123”

2. toFixed() – Rounds the number to a fixed number of decimals.

console.log(floatNum.toFixed(2)); // Outputs: “3.14”

3. toExponential() – Returns the number in exponential notation.

console.log(num.toExponential(2)); // Outputs: “1.23e+2”

4. toPrecision() – Rounds the number to a specified length.

console.log(num.toPrecision(3)); // Outputs: “123”

JavaScript has specific properties for numbers:

1. MAX_VALUE – Returns the largest possible value in JavaScript.

console.log(Number.MAX_VALUE); // Outputs:

1.7976931348623157e+308

2. MIN_VALUE – Returns the smallest positive value.

console.log(Number.MIN_VALUE); // Outputs: 5e-324

3. POSITIVE_INFINITY and NEGATIVE_INFINITY – Represent positive and negative infinity.

console.log(Number.POSITIVE_INFINITY); // Outputs: Infinity

console.log(Number.NEGATIVE_INFINITY); // Outputs: -Infinity

4. NaN – Represents a “Not-a-Number” value.

console.log(isNaN(“Hello” * 3)); // Outputs: true