Function Declaration vs Function Expression: What’s the Difference?

When writing programs, we often need to repeat the same logic multiple times. Instead of rewriting the same code again and again, we can place that logic inside a function. A function is simply a reusable block of code that performs a specific task. Think of a function like a small machine: You give it some inputs It processes them It gives you an output Why Functions Are Useful Functions help us: Reuse code Organize programs into smaller pieces Make code easier to read Avoid repetition For example, imagine we want to add two numbers many times in our program. Without a function: console . log ( 2 + 3 ) console . log ( 10 + 5 ) console . log ( 7 + 8 ) With a function: function add ( a , b ) { return a + b } console . log ( add ( 2 , 3 )) console . log ( add ( 10 , 5 )) console . log ( add ( 7 , 8 )) Function Declaration Syntax A function declaration defines a function using the function keyword followed by a name. function functionName ( parameters ) { // code to run } function greet (