Expressions

An expression is a unit of code that evaluates to a value.

• Arithmetic Operators

  A collection of operators enabling basic arithmetic such as addition and subtraction.

• Array Literal

  Creates an array (ordered lists of elements) and, optionally, populates it with elements.

• Assignment Operators

  Assignment operators enable modification of variables.

• Bitwise Operators

  Bitwise operations operate on the individual bits of numbers in their binary formats.

• Character Literal

  Creates a character value.

• Comma Operator

  Evaluates a series of expressions and returns the value of the last evaluated expression.

• Comparison Operators

  Comparison operators are used for comparing the values of two expressions.

• Concatenation Operator (+)

  Joins two strings.

• Conditional (Ternary) Operator

  Evaluates expressions conditionally.

• Decrement (--)

  Decreases the value of a variable by one (1).

• delete

  Removes a property or method from a JavaScript object.

• false

  Boolean value for false.

• Function Call Expression

  Calls a function with the specified arguments.

• Function Expression

  Defines a function inside an expression.

• Grouping Expression

  Overrides precedence of operations.

• in

  Checks if an object/container has a property or if an index is in an array.

• Increment (++)

  Increases the value of a variable by one (1).

• instanceof

  For internal types, instanceof determines if an object is compatible with a specified type or one of its ancestors. For external types, instanceof determines if one object is in the prototype chain of another.

• Key-Value Container Literal

  Creates a dictionary, map ("associative array"), or external JavaScript object and optionally populates it with key-value pairs.

• Logical Operators

  The logical operators are the logical && (AND) operator, the logical || (OR) operator, and the logical ! (NOT) operator. They are often used in conditionals such as if statements to combine and negate conditions.

• new

  Instantiates a class.

• null

  A value intentionally indicating no value for the data.

• Numeric Literals and Suffixes

  Creates a numeric value.

• Object Literal

  Initialize a JavaScript object using object literal notation, and, optionally, the properties of the object may be specified at creation.

• Regular Expression Literal

  Creates a regular expression value.

• Safe Default (??) Operator

  Evalutes the left-hand side. If the result is not null or undefined, it is returned. Otherwise, the evaluated value of the right-hand side is returned.

• Safe Navigation (?.) Operator

  Gets the class member if the object (left-hand side) is not null.

• Set Literal

  Creates a set or unordered set and, optionally, populates it with values.

• String Literal

  A sequence of characters, enclosed in quotes, for representing textual data.

• super

  'super' refers to the base class instance. The 'super' keyword can also be used to invoke a class constructor or access non-static members of a base class.

• this

  In JS++, 'this' refers to the current instance of a class. The 'this' keyword can also be used to invoke a class constructor or access instance members of a class. For JavaScript code, the 'this' keyword has varying semantics depending on the context in which it is used.

• true

  Boolean value for true.

• Type Cast Operator

  Cast an expression to a specific type.

• typeid

  Returns the type of an expression at runtime.

• typeof

  Returns the type of an expression at runtime. This operator is deprecated. Use typeid instead.

• Unary Negation (-)

  Converts an expression to an int and negates its integer value.

• Unary Plus (+)

  Converts an expression to an int.

• undefined

  The value returned by JS++ for out-of-bounds accesses for internal types, and the value returned when no value has been assigned for external types.

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