Function: meaning, definitions and examples

Used in mathematics, programming, and computer science to describe a block of code that performs a specific task and returns a value. Often found in formal or technical contexts.

• The function calculates the area of a rectangle.
• You need to call the function within your main program.

In object-oriented programming, a method is a function that is associated with an object and can operate on the data contained in the object. Also, 'method' can refer to systematic processes in broader contexts.

• The class includes a method to update the user's profile.
• Her method of studying proved to be very effective.

Commonly used in procedural programming to describe a block of code that performs a task but does not return a value. Also, 'procedure' can refer to a formal way of doing something in different fields like law or medicine.

• The procedure initializes the database connection.
• The surgical procedure took three hours.

An old-fashioned term mostly used in early programming languages like FORTRAN or COBOL. It refers to a sequence of program instructions that perform a task, packaged as a unit. It is generally less common in modern programming.

• The subroutine adds two numbers in the old COBOL program.
• We used a subroutine to handle the input data.

Used in mathematics and programming to describe a relation between a set of inputs and a set of outputs, where each input is related to exactly one output.

• The teacher explained how to graph a quadratic function.
• In Python, a function can take multiple arguments and return a value.

Commonly used in mathematics and sciences to describe the process of linking or associating one set of items with another.

• The geographic mapping of the area showed all the elevations and roads.
• In mathematics, a mapping is a way of assigning elements from one set to another.

Used in mathematics and computing to describe a process or action, often involving mathematical calculations or logical processes.

• Addition is a basic arithmetic operation.
• Computer systems perform various operations to process data.

Often used in mathematics, data science, and other scientific fields to describe a thorough or significant change in form, structure, or appearance.

• The transformation of the caterpillar into a butterfly was fascinating to watch.
• In geometry, a transformation may include rotation, translation, or scaling.

Can also refer to an official event or ceremony.

• We attended a formal function at the mayor's office
• The wedding function was well-organized

Use when talking about the physical control or management of a machine or system, or more broadly, how an organization or entity works.

• The surgeon is set to operate on the patient
• This machine is easy to operate
• Our team operates effectively under pressure

Use when discussing the execution of an action, task, or duty, often in a context where skill or precision is required.

• The actor performed brilliantly on stage
• We need to perform a series of tests
• The machine performed beyond our expectations

Use when discussing the management or control of a system, program, or event, or when something is in operation over a period of time.

• She runs a successful business
• The engine is designed to run for hours without overheating
• They have been running tests for several weeks