CC-00: Functions and Console Logs

with Carmen Salas • 2024/10/01

github

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Code Challenge

1. In this code snippet, what is the argument and what is the parameter?

   const sayHi = (name) => {
     return "Hi" + name
   };
   
   sayHi("fellows");
   

ans: "fellows" is the parameter name is the argument

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1. What is the difference between console.log and the return statement? In your response, be sure to answer the following:

   1. What is the purpose of console.log?

   2. How is the return related to functions in JavaScript?

ans:

1. console.log's main purpose is to essentially see an output into the console. In other programming languages, this is what print would be.

2. Every function has a corresponding return. It is implied to return null in occassions where it is not specified. return by itself acts to terminate a function, and optionally hold a value along with it.

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1. What is printed to the console, when the function sayHi is invoked?

   const sayHi = (name) => {
     console.log(name)
     return "Hi" + name;
   };
   
   sayHi("fellows");
   

ans: fellows is printed when the sayHi function is invoked. The return value however, is "Hifellows".

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1. Run this code in a file, what does the variable hello evaluate to? Why does it evaluate to this?

   const hiFunc = () => {
     console.log("hi");
   };
   
   const hello = hiFunc();
   

ans: In the code above, hello evaluates into "hi", as a console.log output. However hello as a variable remains undefined.

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1. What is the difference between let and const? What is the best practice when choosing which keyword to declare a variable with?

ans: let and const are similar in the sense that they are both keywords used to declare variables. The key difference is that let allows variable re-definition/assignment while const does not.