JavaScript: Calculate how many numbers in the given array are less or equal to the given value using the percentile formula
JavaScript fundamental (ES6 Syntax): Exercise-167 with Solution
Write a JavaScript program to calculate how many numbers in the given array are less or equal to the given value using the percentile formula.
Use Array.prototype.reduce() to calculate how many numbers are below the value and how many are the same value and apply the percentile formula.
Sample Solution:
JavaScript Code:
const percentile = (arr, num) => (arr.filter((item) => item <= num).length / arr.length) * 100;
console.log(percentile([1, 2, 3, 4, 5, 6, 7, 8, 9, 10], 5)) // 50;
console.log(percentile([1, 2, 3, 4, 5, 6, 7, 8, 9, 10], 10)) // 100;
console.log(percentile([1, 2, 3, 4, 5, 6],3)) // 50;
console.log(percentile([1, 2, 3, 4, 5, 6],4)) // 66.66;
Sample Output:
50 100 50 66.66666666666666
Flowchart:

Live Demo:
See the Pen javascript-basic-exercise-167-1 by w3resource (@w3resource) on CodePen.
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Previous: Write a JavaScript program to perform left-to-right function composition for asynchronous functions.
Next: Write a JavaScript program to group the elements into two arrays, depending on the provided function's truthiness for each element.
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JavaScript: Tips of the Day
How to check whether a string contains a substring in JavaScript?
ECMAScript 6 introduced String.prototype.includes:
const string = "foo"; const substring = "oo"; console.log(string.includes(substring));
includes doesn't have Internet Explorer support, though. In ECMAScript 5 or older environments, use String.prototype.indexOf, which returns -1 when a substring cannot be found:
var string = "foo"; var substring = "oo"; console.log(string.indexOf(substring) !== -1);
Ref: https://bit.ly/3fFFgZv
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