How Can I Prevent JavaScript from Converting Large Numbers to Scientific Notation?

Preventing Scientific Notation in JavaScript for Large Numbers

JavaScript notoriously converts integers exceeding 21 digits to scientific notation when they're embedded in strings. This can be problematic when printing these values as part of URLs or other contexts. How can we sidestep this conversion and maintain the original value?

Roll Your Own Solution:

While JavaScript lacks a built-in method specifically designed for this purpose, we can create our own function to handle it. Here's a custom implementation:

function toFixed(x) {
  if (Math.abs(x) < 1.0) {
    var e = parseInt(x.toString().split('e-')[1]);
    if (e) {
        x *= Math.pow(10,e-1);
        x = '0.' + (new Array(e)).join('0') + x.toString().substring(2);
    }
  } else {
    var e = parseInt(x.toString().split('+')[1]);
    if (e > 20) {
        e -= 20;
        x /= Math.pow(10,e);
        x += (new Array(e+1)).join('0');
    }
  }
  return x;
}

Utilizing BigInt:

Modern versions of JavaScript support BigInt, a native type for representing large integers. Using BigInt provides a straightforward way to convert numbers to strings without scientific notation:

let n = 13523563246234613317632n;
console.log(n.toString()); // Output: "13523563246234613317632"

Note: BigInt is still in development and may not be universally supported. Consider using a JavaScript BigInt library if you require compatibility with older browsers.

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