JAVASCRIPT

js check if function exists

if (typeof yourFunctionName == 'function') { 
  yourFunctionName(); 
}

javascript check if function exists

if (typeof sourceObj.someMethod === "function") { 
    // you are safe using the method
  	sourceObj.someMethod();
}

js check if function exists

//check if myProcedure() function exists
if (typeof myProcedure === "function") { 
    // This function exists
}

Check If Function Exists

const obj = {first: function() {console.log("ssss"); return "returns"} };


console.log(_.result(obj, "first"));
/*note that _.result() returns a value, so if your function doesn't return anything _.result() will return undefined*/