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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 }
Updated on: 18-Sep-2020
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