Why does my JavaScript code print undefined before the real value?

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asked 18 days ago

0 Answers

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I’m new to JS and trying to understand how functions work. Here’s my code:

1function sayHello() {
2  var name = "John";
3  console.log(greeting);
4  var greeting = "Hello " + name;
5}
6
7sayHello();
8

1function sayHello() {
2  var name = "John";
3  console.log(greeting);
4  var greeting = "Hello " + name;
5}
6
7sayHello();
8

When I run this, it prints:

1undefined

1undefined

Why does it print undefined instead of "Hello John"?

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