Question

How to get the first and the last digit of a number in TypeScript

Answer 1

function getFirstDigit(num: number) {
    num = Math.abs(num);
      
    while (num >= 10) {
        num = Math.floor(num / 10);
    }
      
    return num;
}
  
const num: number = 230461;
    
const firstDigit: number = getFirstDigit(num);
console.log(firstDigit);
     
const lastDigit: number = num % 10;
console.log(lastDigit);
  
   

/*
run:
   
2
1
   
*/

 

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Answer 2

const num: number = 230461;
    
const numberStr = num.toString();
const firstDigit = numberStr[0];
console.log(firstDigit);
    
const lastDigit = numberStr[numberStr.length - 1];
console.log(lastDigit);
  
  
   
/*
run:
   
"2" 
"1" 
   
*/
   

 

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