Counting below / par elements from an array - JavaScript

We are required to write a function that counts how many of the elements are in the array below / above a given number.

Following is our array of Numbers −

const array = [54,54,65,73,43,78,54,54,76,3,23,78];

For example, if the number is 60, the answer should be five elements below it −

54,54,43,3,23

and five element par it −

65,73,78,76,78

Example

Following is the code −

const array = [54,54,65,73,43,78,54,54,76,3,23,78];
const belowParNumbers = (arr, num) => {
   return arr.reduce((acc, val) => {
      const legend = ['par', 'below'];
      const isBelow = val < num;
      acc[legend[+isBelow]]++;
      return acc;
   }, {
      below: 0,
      par: 0
   });
};
console.log(belowParNumbers(array, 50));
console.log(belowParNumbers(array, 60));
console.log(belowParNumbers(array, 70));

Output

This will produce the following output in console −

{ below: 3, par: 9 }
{ below: 7, par: 5 }
{ below: 8, par: 4 }

AmitDiwan

Published on 18-Sep-2020 12:31:13

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