5 Language features

JavaScript includes many dubious (and even dangerous) features. This sectiondelineates which features may or may not be used, and any additional constraintson their use.

• 5.1 Local variable declarations
• 5.2 Array literals
• 5.3 Object literals
• 5.4 Classes
• 5.5 Functions
• 5.6 String literals
• 5.7 Number literals
• 5.8 Control structures
• 5.9 this
• 5.10 Equality Checks
• 5.11 Disallowed features