JavaScript BigInt Guide

BigInt enables working with integers larger than Number.MAX_SAFE_INTEGER. Here's how to use it effectively.

Best Practices#

When to Use:
✓ IDs larger than MAX_SAFE_INTEGER
✓ Precise integer arithmetic
✓ Cryptographic calculations
✓ High-precision timestamps
✓ Bitwise ops on large numbers

Type Safety:
✓ Explicit type conversion
✓ Check bounds before Number()
✓ Use typeof for type checking
✓ Handle JSON serialization

Performance:
✓ Use Number when safe
✓ Avoid unnecessary conversions
✓ Cache BigInt values
✓ Profile performance-critical code

Avoid:
✗ Mixing with Number in ops
✗ Using Math methods
✗ Assuming JSON support
✗ Using for small integers

BigInt provides arbitrary-precision integers for values beyond Number's safe range. Use the n suffix for literals, convert explicitly between types, and remember that BigInt doesn't work with Math methods or JSON serialization by default. It's ideal for large IDs, cryptographic operations, and precise integer arithmetic. For typical operations within safe integer range, stick with Number for better performance.

JavaScript BigInt Guide

Creating BigInts#

Why BigInt?#

Arithmetic Operations#

Comparison#

Type Coercion#

Bitwise Operations#

Practical Use Cases#

JSON Handling#

TypedArrays with BigInt#

Formatting#

Math Operations#

Performance Considerations#

Best Practices#

Conclusion#

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