Why it worked
The post provides a clear and concise explanation of a common programming concept, using visual aids (code snippets and flowcharts) to illustrate the difference between 'if' and 'switch' statements. It also offers practical advice by prioritizing readability over marginal performance gains, which resonates with developers.
Summary
This post compares the performance of 'if' statements versus 'switch' statements in programming. It explains that switch statements are generally faster due to compiler optimizations like branch tables, but emphasizes that code readability and maintainability should be prioritized over minor performance gains in most real-world scenarios.
Structure
- 1Introduction: If vs Switch Performance
- 2Question: Which code is faster?
- 3Statement: Switch is faster, but why?
- 4Analysis of 'if' statements: sequential evaluation
- 5Analysis of 'switch' statements: direct access via branch table
- 6Conclusion: Prioritize readability over minor performance differences
Call to action
Which option do you prefer? Let me know in the comments!
On-screen text
If vs Switch Performance
SWIPE
Which code do you think is faster?
int n = 3;
if (n == 1) {
// something
} else if (n == 2) {
// something
} else if (n == 3) {
// something
} else {
// something
}
int n = 3;
switch (n) {
case 1:
// something
break;
case 2:
// something
break;
case 3:
// something
break;
default:
// something
}
The switch statement executes faster than a list of ifs, especially when there are many conditions. But why?
Let's analyze the list of if statements first.
All the conditions are evaluated one by one, which means the last condition takes more time to reach.
Gets evaluated immediately -> if(){
// something
}
Has to wait for the previous if -> else if(){
// something
}
Has to wait for the 2 previous ifs -> else if(){
// something
}
Has to wait for the 3 previous ifs -> else(){
// something
}
On the other hand, each case within a switch statement doesn't rely on previous cases.
They all get the same access time, as the compiler implements it using a branch table.
Gets evaluated immediately -> switch(){
case:
// something
break;
Gets evaluated immediately -> case:
// something
break;
Gets evaluated immediately -> case:
// something
break;
Gets evaluated immediately -> case:
// something
break;
}
However, in a real world scenario you're very unlikely to face an efficiency problem for using if statements instead of a switch.
So always prefer the option that improves your code's readability and maintainability.
Which option do you prefer? Let me know in the comments!