Syntax error Difference between numbers and string numbers present in an array in JavaScript

Difference between numbers and string numbers present in an array in JavaScript

Problem

We are required to write a JavaScript function that takes in a mixed array of number and string representations of integers.

Our function should add up okthe string integers and subtract this from the total of the non-string integers.

Example

Following is the code −

 Live Demo

const arr = [5, 2, '4', '7', '4', 2, 7, 9];
const integerDifference = (arr = []) => {
   let res = 0;
   for(let i = 0; i < arr.length; i++){
      const el = arr[i];
      if(typeof el === 'number'){
         res += el;
      }else if(typeof el === 'string' && +el){
         res -= (+el);
      };
   };
   return res;
};
console.log(integerDifference(arr));

Output

Following is the console output −

10
Updated on: 2021-04-19T08:06:43+05:30

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