Can you explain to me in more depth?

Question

what is a variable scope? because in the video it's explained poorly
@Steven Parker (https://teamtreehouse.com/stevenparker)

Steven Parker · Accepted Answer

Sure, I'll give it a shot, but for future questions try giving the whole community some time to answer before tagging anyone specifically.  There are lots of folks wiling to help.
So "variable scope" is basically a way to describe what part of the program a variable can be accessed in.  The most common cases are "global scope", which means the variable can be accessed anywhere, "function scope" where the variable can be accessed only within a specific function, and "block scope" where the variable can be accessed only inside a code block (between a pair of braces {}).  Here's some examples:
```js
var globby = 2;                 // global scope
function test(x) {
  if (x == 1) {
    var funky = 3;              // function scope
    let blocky = 4;             // block scope
    console.log(typeof globby); // "number"
    console.log(typeof funky);  // "number"
    console.log(typeof blocky); // "number"
  }
  console.log(typeof globby);   // "number"
  console.log(typeof funky);    // "number" (still in scope)
  console.log(typeof blocky);   // "undefined"
}
test(1);
console.log(typeof globby);     // "number"
console.log(typeof funky);      // "undefined"
console.log(typeof blocky);     // "undefined"
```

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Ali Dahud

Ali Dahud

Can you explain to me in more depth?

1 Answer

Steven Parker

Steven Parker

Ali Dahud

Ali Dahud

Ali Dahud

Ali Dahud

Steven Parker

Steven Parker