How Can I Prevent Scientific Notation for Large Numbers in JavaScript?

Preventing Scientific Notation for Large Numbers in JavaScript

When working with exceptionally large numbers in JavaScript, it's common to encounter scientific notation upon conversion to strings. This can be problematic, particularly in scenarios like printing integers as part of URLs or other contexts. The following solutions aim to address this issue:

1. Using Number.toFixed() (Limited Precision)

The Number.toFixed() method can be employed to control the number of decimal places. However, it has limitations:

• If the number is greater than or equal to 1e21, scientific notation will be used.
• Precision is limited to 20 digits.

2. Custom Implementation (JavaScript)

A JavaScript-based function, as showcased below, offers custom handling of large numbers:

function toFixed(x) {
  if (Math.abs(x) < 1.0) {
    // Handle numbers less than 1
  } else {
    // Handle numbers greater than or equal to 1e21
  }
  return x;
}

This function handles both large and small numbers, allowing for the display of very large integers without scientific notation.

3. Using BigInt (Recommended, Modern JavaScript)

The modern JavaScript implementation of BigInt is the recommended approach for handling large integers. It bypasses the limitations of Number.toFixed() and allows for arbitrary precision. To convert a number to a BigInt, simply use the BigInt() constructor:

let n = 13523563246234613317632;
console.log(BigInt(n).toString());

This method ensures accurate representation and avoids the inconvenience of scientific notation for very large integers.

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