Question

How to check if a function is defined in TypeScript

Answer 1

if (typeof add === 'function') {
  	console.log('add function is defined');
} else {
  	console.log('add function is not defined');
}

function toHexArray(arr : any) {
 
}

if (typeof toHexArray === 'function') {
  	console.log('toHexArray function is defined');
} else {
  	console.log('toHexArray function is not defined');
}
  
 
 
 
   
/*
run:
  
"add function is not defined" 
"toHexArray function is defined" 
   
*/

 

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