Make numbers in array relative to 0 – 100 in JavaScript

Let’s say, we have an array that contains some numbers, our job is to write a function that takes in the array and maps all the values relative to 0 to 100. Means that the greatest number should get replaced by 100, the smallest by 100 and all others should get converted to specific numbers between 0 and 100 according to the ratio.

Following is the code for doing the same −

Example

const numbers = [45.71, 49.53, 18.5, 8.38, 38.43, 28.44];
const mapNumbers = (arr) => {
   const max = Math.max(...arr);
   const min = Math.min(...arr);
   const diff = max - min;
   return arr.reduce((acc, val) => acc.concat((100/diff)*(val-min)), []);
};
console.log(mapNumbers(numbers));

Output

The output in the console will be −

[
   90.71688942891859,
   100,
   24.59295261239368,
   0,
   73.02551640340218,
   48.74848116646417
]