Question

How to check if a function is defined in Node.js

Answer 1

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

function toOctArray(arr) {
 
}

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

 

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