Efficient code is code that achieves the desired result using fewer resources like memory, processing power or time. The document gives examples of inefficient code and how they could be made more efficient through techniques like using loops for repetition instead of writing the same code multiple times, storing multiple values in an array instead of separate variables, using elif and else statements in selection to avoid unnecessary comparisons, and using logical operators like and/or to combine conditions in an if statement.

1. Code Efficiency

2. What is
efficient code?
 A program can be written in may different ways.
 Although the different solutions achieve the same
result, programmers should try and write code that is
efficient.
 Efficient code is best explained in examples...

3. Repetition
This is notefficient
code.
It does the same
thing 5 times.
How could it be
made more
efficient?

4. Repetition
By using a loop the
code is more
efficient.
This is especially the
case when looping a
large number of
times.

5. 1DArrays
This is notefficient
code.
It uses 6 variables to
storethenames of 6
users.
How could it be
made more
efficient?

6. 1DArrays
A 1D array can be
used to store the 6
names.
This makes the code
more efficient.

7. Selection
This is notefficient
code.
It makes 4
comparisons every
time.
How could it be
made more
efficient?

8. Selection
By using elif and
else statements, the
code will not always
run all 4
comparisons
This makes the code
more efficient.

9. Logical
Operators
Splitting the if
statement into 2
like this is not the
best solution.
How else might it
be done?

10. Logical
Operators
It is betterpractice
to use and / or to
createa complex if
statement.
More readable code