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4 Ways to increase salaries in a list.

A common task in software engineering is list manipulation. In this example we convert a list of salaries to a new list of salaries, where each salary is raised by 20%.

We use 4 different methods for this:

  1. Loop
  2. Map using a function
  3. Map using a lambda
  4. List comprehension

We start with the traditional approach and loop throught the list of salaries, take an element from the list, multiply by 1.2 and append the result to a target list.

Loop

salaries = [2000, 2200, 1800, 1900, 2400]

raised_salaries = []

for s in salaries:
    raised_salaries.append(s * 1.2)

for s in raised_salaries:
    print(s)

Output:

2400.0
2640.0
2160.0
2280.0
2880.0

Map with function

salaries = [2000, 2200, 1800, 1900, 2400]

def raise_salary(salary):
    return salary * 1.2

raised_salaries = map(raise_salary, salaries)

for s in raised_salaries:
    print(s)

Output:

2400.0
2640.0
2160.0
2280.0
2880.0

Map with lambda

salaries = [2000, 2200, 1800, 1900, 2400]

raised_salaries = map(lambda salary: salary * 1.2, salaries)

for s in raised_salaries:
print(s)

Output:

2400.0
2640.0
2160.0
2280.0
2880.0

List comprehension

salaries = [2000, 2200, 1800, 1900, 2400]

raised_salaries = [salary * 1.2 for salary in salaries]

for s in raised_salaries:
print(s)
      

Output:

2400.0
2640.0
2160.0
2280.0
2880.0