What is a lambda function?

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A lambda function in programming is a small, anonymous function defined without a name. It’s commonly used in languages like Python, Java, and JavaScript, primarily for short, simple operations that can be defined in a single line.

In Python, a lambda function is written using the lambda keyword, followed by one or more arguments, a colon, and an expression.

Lambda functions are often used where functions are required as arguments, such as in map(), filter(), or sorted().

Key features of lambda functions:

• Anonymous: They don’t need a name unless assigned to a variable.

• Concise: Ideal for short operations, usually one-liners.

• Limited: They can only contain a single expression—no statements or multiple lines.

When to use lambda functions:

• When you need a quick, throwaway function.

• Inside functions like sorted(), map(), or filter() where a simple operation is applied.

• When writing clean, compact code for simple transformations.

However, for more complex operations, using regular functions with def is better for readability and maintainability. 

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