⚡ Lambda Expressions

Lambda expressions are small, anonymous functions written in a single line. They are commonly used for short transformations and callbacks.

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✅ Syntax

lambda args: expression

Examples:

square = lambda x: x * x
square(4)  # 16

add = lambda a, b: a + b
add(2, 3)  # 5

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✅ When to Use

• Short, simple logic
• Passed to higher-order functions (e.g., map, filter, sorted)
• Inline callbacks

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✅ Common Examples

Sorting with a key

names = ["Alice", "bob", "charlie"]
sorted(names, key=lambda n: n.lower())

Filtering with a lambda

nums = [1, 2, 3, 4, 5]
evens = list(filter(lambda x: x % 2 == 0, nums))

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⚠️ Keep It Readable

If the logic gets complex, use a named function instead. Readability matters more than brevity.

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🔍 Key Takeaways

• Lambda functions are anonymous and single-expression.
• Best for short, simple operations.
• Often used with higher-order functions.

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Next: Map, Filter, Reduce