An expression is a phrase of JavaScript that a JavaScript interpreter can evaluate to produce a value.

• 1.5 // Numeric literal
• “Keith Donean” // String literal
• true // Boolean literal
• null // Null literal value
• /java/ A regular expression literal
• { x:2, y:2 } // An object literal
• [2, 3, 5, 7, 11, 13] // An array literal
• function(x) { return x+x; } // A functionliteral
• a //The variable a