13.8 Additive Operators

Syntax

AdditiveExpression[Yield, Await] : MultiplicativeExpression[?Yield, ?Await] AdditiveExpression[?Yield, ?Await] + MultiplicativeExpression[?Yield, ?Await] AdditiveExpression[?Yield, ?Await] - MultiplicativeExpression[?Yield, ?Await]

13.8.1 The Addition Operator ( + )

Note

The addition operator either performs string concatenation or numeric addition.

13.8.1.1 Runtime Semantics: Evaluation

AdditiveExpression : AdditiveExpression + MultiplicativeExpression
  1. Return ? EvaluateStringOrNumericBinaryExpression(AdditiveExpression, +, MultiplicativeExpression).

13.8.2 The Subtraction Operator ( - )

Note

The - operator performs subtraction, producing the difference of its operands.

13.8.2.1 Runtime Semantics: Evaluation

AdditiveExpression : AdditiveExpression - MultiplicativeExpression
  1. Return ? EvaluateStringOrNumericBinaryExpression(AdditiveExpression, -, MultiplicativeExpression).