Question

How to decrement letters in TypeScript

Answer 1

function prevChar(char : string) : string {
  	return String.fromCharCode(char.charCodeAt(0) - 1);
}


console.log(prevChar('a')); 
console.log(prevChar('b')); 
console.log(prevChar('c')); 

console.log(prevChar('A')); 
console.log(prevChar('B')); 
console.log(prevChar('C'));  
  
  
  
  
/*
run:
  
"`" 
"a" 
"b" 
"@" 
"A" 
"B" 
  
*/

 

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