Lambda confusion

Question

I am struggling with lambda.I don't know how to use lambda🤨Can anyone help me with examples?

Answer 1

Nvm, I searched your page and noticed you're studying python.

Here are some information and examples.

https://www.w3schools.com/python/python_lambda.asp

Answer 2

What is lambda?

Answer 3

Lambda is an expression, that returns a function.

lambdas:
-Can only have 1 line of statements, that should end up in 1 single object.
-Do not necessarily need to be given a name in declaration.
-Can be called straight after declaration.

Declaring function with def:
def a(x):
print(x)

Declaring the same function with lambda:
a = lambda x: print(x)

Calling a lambda function straight after declaration without giving it a name:
(lambda: print("Hello"))()

print((lambda x: x + x * 8)(7)) #7 + 7 * 8 = 63
You can use as complex calculations as you want in lambda functions, but it must end up in 1 single object, which means that you can only use statements, that return a value.
For example basic if statement does not return a value, you can not do: x = (if y: print(z)), because if statement self does not return any values.

Answer 4

If we want to perform an operation squaring the numbers like n*n we have to define a function def and have to create a name. For example,

def square(n):
result n*n

result = square(7)
print(result)

Output = 49.

Here in python we can also create a function without using name . For example,

lambda n : n * n

We know functions in python are objects. So,

f = lambda n : n * n

result = f(7)
print(result)

Output : 49

Hope you understand :)