I declared a variable in my JavaScript code, but when I try to use it, I’m getting “undefined.” What’s wrong?

Here are some potential causes:

Variable declaration after usage: Make sure the variable is declared before you try to access it.

• Block scope issues: If you declared the variable using let or const inside a block (like an if statement or loop), it’s only accessible within that block.

// Incorrect
if (true) {
  let myVar = "Hello";
}
console.log(myVar); // Error: myVar is not defined
// Correct
let myVar;
if (true) {
  myVar = "Hello";
}
console.log(myVar); // Output: Hello