Question

How to check if a sequence of numbers is a Geometric progression (consecutive ratios are the same) in JavaScript

Answer 1

function isGeometricProgression(arr) {
    const size = arr.length;
        
    if (size === 1) {
        return true;
    }

    const ratio = arr[1] / arr[0];

    for (let i = 1; i < size; i++) {
        if ((arr[i] / arr[i - 1]) !== ratio) {
            return false;
        }
    }

    return true;
}

const arr = [9, 27, 81, 243, 729, 2187];

console.log(isGeometricProgression(arr) ? "Yes" : "No");



/*
run:

Yes

*/

 

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