Python - Lambda function to find the smaller value between two elements

Lambda functions are anonymous functions in Python that provide a concise way to write small operations without defining a full function. In this article, we'll explore different methods to find the smaller value between two elements using lambda functions.

Using Conditional Expression (if-else)

The most straightforward approach uses Python's conditional expression within a lambda function ?

# Direct lambda with conditional expression
smaller = lambda a, b: a if a < b else b

a = 45
b = 24
result = smaller(a, b)
print(f"The smaller number between {a} and {b} is: {result}")

The smaller number between 45 and 24 is: 24

Using min() Function

The min() function returns the smallest value among arguments. We can wrap it in a lambda for consistency ?

Syntax

min(arg1, arg2, ..., argN, key=func)

Example

# Lambda function using min()
find_smaller = lambda a, b: min(a, b)

a = 47
b = 24
result = find_smaller(a, b)
print(f"The smaller number between {a} and {b} is: {result}")

The smaller number between 47 and 24 is: 24

Using sorted() Method

The sorted() function returns a new sorted list. We can take the first element to get the smallest value ?

Syntax

sorted(iterable, key=key, reverse=Boolean)

Example

# Lambda function using sorted()
find_smaller = lambda a, b: sorted([a, b])[0]

a = 455
b = 89
result = find_smaller(a, b)
print(f"The smaller number between {a} and {b} is: {result}")

The smaller number between 455 and 89 is: 89

Using reduce() Function

The reduce() function from the functools module applies a function cumulatively to items in an iterable ?

from functools import reduce

# Lambda function with reduce
smaller = lambda a, b: a if a < b else b
numbers = [4557, 66]

result = reduce(smaller, numbers)
print(f"The smaller number between {numbers[0]} and {numbers[1]} is: {result}")

The smaller number between 4557 and 66 is: 66

Comparison

Conclusion

For finding the smaller value between two elements, use min() for clarity or conditional expression for performance. Lambda functions provide elegant one-liner solutions for simple comparison operations.