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Merge pull request #55 from josemoracard/jose4-06-lambda-functions
exercises 06-lambda-functions to 10-Array-Methods
2 parents 3f857d4 + a438081 commit b3d24db

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# `06` Funciones Lambda en Python
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# `06` Lambda Functions in Python
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Una **función lambda** es una función con solo una línea de código y sin nombre.
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Es un tipo de función muy especial en el mundo Python porque puedes usarla como una 'pequeña utilidad' para una programación muy ágil:
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Es un tipo de función muy especial en el mundo Python porque puedes usarla como una pequeña utilidad para una programación muy ágil:
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```python
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# declarando una función normal para una multiplicación
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# Declarando una función normal para una multiplicación
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def multiply(p1, p2):
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return p1 * p2
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# declarándola en una línea como una función lambda
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# Declarándola en una línea como una función lambda
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multiply = lambda p1,p2: p1 * p2
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```
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1. Las **funciones lambda** tiene que ser siempre muy pequeñas.
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### 👉 Caracteristicas:
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2. Las **funciones lambda** pueden tener únicamente una línea.
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+ Las **funciones lambda** tienen que ser siempre muy pequeñas.
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3. Las **funciones lambda** no necesitan un `return`, se asume que lo que haya en esa línea devolverá un valor.
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+ Las **funciones lambda** pueden tener únicamente una línea.
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4. Las **funciones lambda** pueden almacenarse en variables o ser pasadas como parámetro a otra función.
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+ Las **funciones lambda** no necesitan un `return`, se asume que lo que haya en esa línea devolverá un valor.
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+ Las **funciones lambda** pueden almacenarse en variables o ser pasadas como parámetro a otra función.
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## 📝 Instrucciones:
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1. Crea una variable llamada `is_odd`.
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2. Asígnale una función lambda que devuelva `True` o `False` dependiendo de si un número dado es impar o no.
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2. Asígnale una función **lambda** que devuelva `True` o `False` dependiendo de si un número dado es impar o no.
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## 💡 Pista:
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+ Así es como declararías una función normal:
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```python
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# Esta función retorna `True` si el número es impar
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# Esta función retorna "True" si el número es impar
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def is_odd(num):
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return (num % 2) != 0
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```

‎exercises/06-lambda-functions/README.md

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---
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# `06` Lambda functions in Python
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# `06` Lambda Functions in Python
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A **lambda function** is a function with just one line of code and no name.
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It is a very special type of funcion in the world of python because you can use it as a small utility for very agile coding:
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It is a very special type of function in the world of Python because you can use it as a small utility for very agile coding:
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```python
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# declaring a normal funcion for multiplication
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# Declaring a normal function for multiplication
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def multiply(p1, p2):
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return p1 * p2
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# declaring it now like a one line lambda
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# Declaring it now like a one line lambda function
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multiply = lambda p1,p2: p1 * p2
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```
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:point_uo:Facts:
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+**Lambda fuctions** have to be always very small.
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### 👉 Facts:
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+ **Lambda function** can only have one line.
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+ **Lambda functions** have to always be very small.
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+ **Lambda function** doesn't need a `return` statement (it is assumed that it will return whatever is on that one line).
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+ **Lambda functions** can only have one line.
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+ **Lambda functions** can be stored in variables or passed as parameters to another function
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+ **Lambda functions** don't need a `return` statement (it is assumed that it will return whatever is on that one line).
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+ **Lambda functions** can be stored in variables or passed as parameters to another function.
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## 📝 Instructions:
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1. Create a variable called `is_odd`.
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2. Assign a **lambda function** to it that returns `True` or `False` if a given number is odd.
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## 💡Hint
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## 💡Hint
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+ Here is how you would declare it like a normal function:
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```py
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# this function return True if a number is odd.
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# This function returns True if a number is odd
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def is_odd(num):
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return num % 2 != 0
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```

‎exercises/06-lambda-functions/app.py

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# your function here
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# Your function here
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# Your function here
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is_odd = lambda num: num % 2 != 0

‎exercises/06-lambda-functions/tests.py

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import io, sys, pytest, os, re, mock
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@pytest.mark.it("Declare a function 'is_odd' as lambda")
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@pytest.mark.it("Declare a function called 'is_odd' as lambda")
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def test_declare_variable():
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path = os.path.dirname(os.path.abspath(__file__))+'/app.py'
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with open(path, 'r') as content_file:
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import app as app
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assert callable(app.is_odd)
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@pytest.mark.it('The function is_odd must receive one number and return true if is odd or false otherwise')
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@pytest.mark.it('The function is_odd must receive one number and return True if the number is odd or False otherwise')
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def test_for_integer(capsys):
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import app as app
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assert app.is_odd(3) == True
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@pytest.mark.it('We tested the function with 2 and the result was not False')
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def test_for_integer2(capsys):
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import app as app
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assert app.is_odd(2) == False
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assert app.is_odd(2) == False
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# `07` Funciones Lambda
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# `07` Lambda Functions
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**:point_up: Recuerda:**
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### ☝ Recuerda:
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Las funciones Lambda permiten una sintaxis corta para escribir expresiones de funciones.
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```python
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multy = lambda x, y: x * y
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print(multy(2,2))
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multiply = lambda x, y: x * y
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print(multiply(2,2))
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```
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## 📝 Instrucciones:
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## 💡 Pista:
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+ Busca en Google "remove last letter form string python" (puedes usar los corchetes).
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+ Busca en Google "como eliminar el último caracter de un string python" (puedes usar los corchetes).

‎exercises/07-lambda-function-two/README.md

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tutorial: "https://www.youtube.com/watch?v=1HwmTkQPeMo"
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---
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# `07` Lambda functions
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# `07` Lambda Functions
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**:point_up:Remember:**
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### ☝ Remember:
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Lambda functions allows a short syntax for writing function expressions.
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Lambda functions allow a short syntax for writing function expressions.
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```python
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multy = lambda x, y: x * y
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print(multy(2,2))
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multiply = lambda x, y: x * y
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print(multiply(2,2))
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```
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## 📝 Instructions:
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1. Create a lambda function called `rapid` it will take one string parameter.
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1. Create a lambda function called `rapid`, which will take one string parameter.
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2. Return the same string with the last letter removed.
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## 💡 Hint
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## 💡 Hint:
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+ Google how to "remove last letter form string python" (you can use the square brackets).
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+ Google "how to remove last letter from string python" (you can use the square brackets).

‎exercises/07-lambda-function-two/app.py

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# From this line above, plese do not change code below
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print(rapid("bob")) #should print bo
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# Your code above, please do not change code below
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print(rapid("bob")) # Should print "bo"
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rapid = lambda myStr: myStr[:-1]
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# From this line above, plese do not change code below
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print(rapid("bob")) #should print bo
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# Your code above, please do not change code below
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print(rapid("bob")) # Should print "bo"

‎exercises/07-lambda-function-two/tests.py

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import io, sys, pytest, os, re, mock
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@pytest.mark.it("Declare a function 'rapid' as lambda")
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@pytest.mark.it("Declare a function called 'rapid' as lambda")
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def test_declare_variable():
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path = os.path.dirname(os.path.abspath(__file__))+'/app.py'
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with open(path, 'r') as content_file:
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def test_for_callable(capsys):
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from app import rapid
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@pytest.mark.it('The function rapid must receive one string and return the same but without the last letter (make sure it\'s lowecase)')
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@pytest.mark.it('The function rapid must receive one string and return the same string without the last character')
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def test_for_integer(capsys):
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from app import rapid
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assert rapid("maria") == "mari"

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