The proper way to compare numbers in JavaScript

I need to determine the color for my legend by comparing two values without using ceil, floor, or round functions. The color is based on a color table with point and RGB values.

The backend provides points like 0.4607441262895224, 0.5500956769649571, etc. I must compare these points to the first value in the color table to assign the correct color. However, precision of only two decimal places is causing issues.

"colors": [
[ 0.00, 255, 13, 186 ],
[ 0.25, 254, 4, 135 ],
[ 0.50, 73, 255, 35 ],
[ 0.75, 185, 116, 255 ],
[ 1.00, 32, 50, 255 ]
]

// main logic
const test = arraySet.find((ele) => {
  // dynamic point value
  const point = 0.388920938
  // Unable to use toFixed(2) here, which needs modification
  // ele[0] represents values like 0.00, 0.25, 0.50, etc.
  return point.toFixed(2) == ele[0].toFixed(2);}
);

Answer №1

Maybe you're looking for something like this:

Math.abs(point-ele[0]) < 0.01 

Instead of 0.01, consider using a threshold specific to your data, such as 1e-6 for 10^(-6)

Answer №2

The ToFixed method will automatically round the number

const roundNumber=(num)=>Number(num.toString().match(/^\d+(?:\.\d{0,2})?/));

Answer №3

Perhaps you should attempt it in this manner

if (string.valueOf(point).substring(0, ele.toString().length) === ele) {
   return true;
}

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