Language.md

Language Features

Status of core JavaScript language features in GiavaScript.

Declarations and assignments

Feature	Status
var declaration	Available
var without initializer	Available
Reassignment with =	Available
Compound assignment (+=, -=, *=, /=)	Available
Postfix increment and decrement (++, --)	Available
let	Not available
const	Not available

Expressions and operators

Feature	Status
Numeric literals (int, float)	Available
String literals (single and double quotes)	Available
Arithmetic (+, -, *, /, %)	Available
Exponent operator (^, non-standard)	Available
Parenthesized expressions	Available
Comparisons (<, >, <=, >=)	Available
Equality (==, !=)	Available
Strict equality (===, !==)	Available
Logical operators (&&, ||, !)	Available
typeof operator	Available
void operator	Available

Equality operator semantics

• == and != use coercive (loose) equality behavior.
• === and !== use strict (non-coercive) equality behavior.

Logical operator semantics

• a && b: evaluates a first; if a is falsy, returns a and does not evaluate b; otherwise evaluates and returns b.
• a || b: evaluates a first; if a is truthy, returns a and does not evaluate b; otherwise evaluates and returns b.
• !a: evaluates a and returns a boolean negation (true/false).
• Precedence: ! binds tighter than &&, and && binds tighter than ||.

Functions and control flow

Feature	Status
Function declarations (function name(...) { ... })	Available
Function expressions (var f = function(...) { ... })	Available
Function calls	Available
Returning values with return	Available
First-class function values	Available
if, else if, else	Available
for (...) loops	Available
break / continue inside loops	Available
while / do...while loops	Available
switch statements	Available

Values and collections

Feature	Status
null	Available
undefined	Available
Array literals and indexing	Available
Object literals	Available
Dot and bracket property access	Available
Template literals	Available

Classic global functions

Feature	Status
parseInt()	Available
parseFloat()	Available
isNaN()	Available

Notes

• This reflects current behavior in the interpreter and specs.