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clarifying description and code for static block 'var' hoisting #35793

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Sep 8, 2024
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clarifying description and code for static block 'var' hoisting #35793

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clarifying description and code for static block 'var' hoisting
getify Sep 8, 2024
8278ac5
Update files/en-us/web/javascript/reference/classes/static_initializa…
getify Sep 8, 2024
b47d85f
Update files/en-us/web/javascript/reference/classes/static_initializa…
getify Sep 8, 2024
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8 changes: 6 additions & 2 deletions files/en-us/web/javascript/reference/classes/static_initialization_blocks/index.md
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Expand Up @@ -41,19 +41,23 @@ A {{jsxref("Statements/class", "class")}} can have any number of `static {}` ini
These are [evaluated](/en-US/docs/Web/JavaScript/Reference/Classes#evaluation_order), along with any interleaved static field initializers, in the order they are declared.
Any static initialization of a super class is performed first, before that of its sub classes.

The scope of the variables declared inside the static block is local to the block. This includes `var`, `function`, `const`, and `let` declarations. `var` declarations in the block are not hoisted.
The scope of the variables declared inside the static block is local to the block. This includes `var`, `function`, `const`, and `let` declarations. `var` declarations will not be hoisted out of the static block.

```js
var y = "Outer y";

class A {
static field = "Inner y";
static {
// var y only hoisted inside block
console.log(y); // undefined <-- not 'Outer y'

var y = this.field;
}
}

// var defined in static block is not hoisted
// var y defined in static block is not hoisted
// outside the block
console.log(y); // 'Outer y'
```

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