JavaScript is a programming language that is one of the core technologies of the World Wide Web, alongside HTML and CSS. It is a high-level, often just-in-time compiled language that conforms to the ECMAScript standard. It has dynamic typing, prototype-based object-orientation, and first-class functions. It is multi-paradigm, supporting event-driven, functional, and imperative programming styles. It has application programming interfaces (APIs) for working with text, dates, regular expressions, standard data structures, and the Document Object Model (DOM) .
JavaScript has both binary and unary operators, and one special ternary operator, the conditional operator. A binary operator requires two operands, one before the operator and one after the operator. For example, 3 + 4 or x * y. A unary operator requires a single operand, either before or after the operator. For example, -x or x++ .
Some common JavaScript operators include:
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Arithmetic Operators: Used to perform arithmetic operations on numbers, such as addition (+), subtraction (-), multiplication (*), and division (/) .
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Assignment Operators: Used to assign values to variables, such as the equals sign (=) .
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Comparison Operators: Used to compare values, such as the greater than (>) and less than (<) operators.
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Logical Operators: Used to perform logical operations on values, such as the AND (&&) and OR (||) operators.
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Conditional Operators: Used to assign a value to a variable based on a condition, such as the ternary operator (condition ? value1 : value2) .
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Type Operators: Used to determine the type of a value, such as the typeof operator.
JavaScript also has other operators, such as the delete operator, which is used to delete object properties, and the in operator, which is used to check if an object contains a specified property.
In addition to operators, JavaScript also has expressions, which are valid units of code that can be evaluated to a value. Examples of expressions include variables, literals, and function calls.
