Question

How to create a function that returns true if a letter in TypeScript

Answer 1

let isAlpha = function(ch : string) {
  	return /^[A-Z]$/i.test(ch);
}
        
console.log(isAlpha('z'));

console.log(isAlpha('@'));



  
  
  
  
/*
run:
  
true
false
  
*/

 

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