Check if Digit is Divisible by Previous Digit in JavaScript

Problem

We are required to write a JavaScript function that takes in a number and checks each digit if it is divisible by the digit on its left and returns an array of booleans.

The booleans should always start with false because there is no digit before the first one.

Example

Following is the code −

 Live Demo

const num = 73312;
const divisibleByPrevious = (n = 1) => {
   const str = n.toString();
   const arr = [false];
   for(let i = 1; i < str.length; ++i){
      if(str[i] % str[i-1] === 0){
         arr.push(true);
      }else{
         arr.push(false);
      };
   };
   return arr;
};
console.log(divisibleByPrevious(num));

Output

[ false, false, true, false, true ]