Expression

An expression is a piece of source code that produces a value at runtime.

Related concepts:  EvaluationValue

Closest Wikipedia entry:  Expression (computer science) — In computer science, an expression is a syntactic entity in a programming language that may be evaluated to determine its value. It is a combination of one or more constants, variables, functions, and operators that the programming language interprets (according to its particular rules of precedence and of association) and computes to produce ("to return", in a stateful environment) another value. This process, for mathematical expressions, is called evaluation.

Misconceptions about Expression

51 documented Misconceptions

CompareBooleanToConstant

To test whether an expression evaluates to true or false, one must compare it to a constant

EqualityOperatorComparesListIdentities

(list a) = (list b) compares the identities of list a and list b

ExpressionAssigns

An expression that reads a variable also updates its value after the evaluation