BigInt is a built-in object in JavaScript that provides a way to represent whole numbers larger than 2⁵³ - 1, which is the largest number JavaScript can reliably represent with the Number primitive. Introduced in ECMAScript 2020, BigInt is crucial for applications that require precise handling of large integers, such as scientific calculations, precise time-stamping, and working with large databases.

Why Use BigInt?

• Precision: Regular JavaScript numbers lose precision for values above 2⁵³ - 1. BigInt allows for precise arithmetic on very large integers.
• Security: Essential in cryptographic applications where precise handling of large numbers is mandatory.
• Compatibility: Works seamlessly alongside other numeric types, though it cannot be mixed directly in operations with regular Number types without explicit conversion.

Syntax

To create a BigInt, append n to the end of an integer or use the BigInt() constructor:

Key Characteristics

• Type: typeof largeNumber will return "bigint".
• Limitations: Cannot be used with methods in the Math object directly; all operands in a calculation must be of type BigInt if one is a BigInt.

Example: Basic Operations with BigInt

Explanation:

• Creating BigInts: firstBigInt and secondBigInt are defined with the BigInt literal notation.
• Addition and Multiplication: Demonstrates basic arithmetic operations. Note that results of operations involving BigInts are also BigInts (30n and 200n).
• Comparisons: Like other types, BigInts can be compared using standard comparison operators. Here, === is used to check for equality.

BigInt is a powerful addition to JavaScript's numeric ecosystem, allowing developers to handle very large integers accurately. This capability is especially useful in financial services, cryptography, and scientific fields where precision is crucial. As web applications continue to evolve and handle more complex and voluminous data, the importance of understanding and using BigInt in JavaScript will only increase.