Thread by @ATechAjay

💛 Day 2️⃣3️⃣ / 3️⃣0️⃣ days of basics in JavaScript series!

→ What is a function declaration?

→ What is a function statement?

→ What is function expression?

→ Difference between function declaration & function expression?

→ What is an anonymous function?

#javascript30
🧵⇩

📌 What is a function declaration?

→ A function declaration always starts with the "function" keyword.

→ The function declaration must have a function name.

📌 What is a function statement?

→ The function statement is the synonym of the function declaration.

→ Both are the same.

📌 What is function expression?

→ This is also a function but without a function name.

→ A function expression can be stored in a variable using the (=) assignment operator.

→ The function can be assigned in a variable as a value using the (=) assignment operator.

→ And they are always called(invoke / run) using the name of the variable.

→ Here "squares" is the name of the variable.

📌 Difference between function declaration & function expression?

→ The main difference is that function declaration is hoisted but not function expression.

→ We can call/invoke the function declaration "after" and "before" the function definition.

→ But function expression can only invoke/run/call "after" the function definition.

→ If we call the function expression before initialization, then this will give an error.

📌 What is an anonymous function?

→ A function without a name is called an anonymous function.

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