Core features

The following core features are supported.

Types

The following types are supported:

• numbers

• strings

• booleans

• objects

• arrays

• functions

Operators

Operators are supported, including:

• standard math operators (+, -, /, %, *, etc.)

• nullish coalescing operator (??)

• Optional chaining (?.)

The following operators are not supported:

• bitwise operators

• unary operators (++, --, and ~)

• void and typeof operators

Statements

The following statements are supported:

• const

• let

• var

• break

• else

• for-in

• for-of

• if

• return

• switch

• var

• spread syntax

The following are not supported:

• catch

• continue

• do-while

• finally

• for(initialization; condition; afterthought)

  Note

  The exceptions are for-in and for-of expressions, which are supported.

• throw

• try

• while

• labeled statements

Literals

The following ES 6 template literals are supported:

• Multi-line strings

• Expression interpolation

• Nesting templates

Functions

The following function syntax is supported:

• Function declarations are supported.

• ES 6 arrow functions are supported.

• ES 6 rest parameter syntax is supported.

Strict mode

Functions operate in strict mode by default, so you don’t need to add a use_strict statement in your function code. This cannot be changed.