Question

How to get the first and the last digit of a number in Node.js

Answer 1

function getFirstDigit(number) {
    number = Math.abs(number);
      
    while (number >= 10) {
        number = Math.floor(number / 10);
    }
      
    return number;
}
  
const number = 98037;
    
const firstDigit = getFirstDigit(number);
console.log(firstDigit);
     
const lastDigit = number % 10;
console.log(lastDigit);
  
  
   
/*
run:
   
9
7
   
*/

 

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Answer 2

const number = 98037;
    
const numberStr = number.toString();
const firstDigit = numberStr[0];
console.log(firstDigit);
    
const lastDigit = numberStr[numberStr.length - 1];
console.log(lastDigit);
  
  
   
/*
run:
   
9
7
   
*/

 

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