What is an expression in the context of JavaScript?

An expression in JavaScript is any fragment of code that produces a value.

Examples of expressions:

• Literals (strings, numbers, arrays, objects):

  // Numeric literal
  10
  
  // String literal
  "hello"
  
  // Array literal
  [1, 2, 3]
  
  // Object literal
  { name: "Alice" }
  

• Identifiers (variable names):

  // Variable identifier, returns the variable's value
  myVariable
  

• Arithmetic and logical operations:

  // Arithmetic expression
  5 + 3 * 2
  
  // Logical expression
  a > b && c < d
  

• Function calls:

  // Function call, returns the value returned by the function
  myFunction(arg1, arg2)
  

• Assignment (the value of an assignment expression is the assigned value):

  // Assignment expression
  x = 10
  

• Ternary operator:

  // Ternary expression
  condition ? value1 : value2
  

Unlike operators, expressions always return a value.