Hello friends, In this short article, we will see, how can we call one function inside second in JavaScript.

Let's consider you have a function named makeAddition() as follows:
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function makeAddition(a,b){
   var c = a+b;
   alert("Addition: "+ c);
}
Now if you have another function named makeSubtraction() as follows:
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function makeSubtraction(a,b){
   var d = a-b;
   alert ("Subtraction: "+ d);
}
You can call makeAddition function inside makeSubtraction function as follows:
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function makeSubtraction(a,b){
   var d = a-b;
   alert ("Subtraction: "+ d);
   makeAddition (4,5);
}
Now when you call makeSubtraction (10,5), it will first alert answer as 5 and then it will call makeAddition function and will alert answer as 9.