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Does “variables should live in the smallest scope as possible” include the case “variables should not exist if possible”?
2019 Community Moderator ElectionRationale to prefer local variables over instance variables?Is it OK to use dynamic typing to reduce the amount of variables in scope?How to deal with variables when extracting methods in to smaller methods?How to refactor a Python “god class”?Should a structure be refactored into smaller structures?How to refactor my project to have less mutable objects?Is Java package level scope useful?How do you safely refactor in a language with dynamic scope?Should I unit test the consuming class or the class running the logic?How to not test implementation when method returns void?Rationale to prefer local variables over instance variables?
According to https://softwareengineering.stackexchange.com/a/388055/248528, variables should live in the smallest scope as possible, simplify the problem into my interpretation, it means we should refactor this kind of code:
public class Main
private A a;
private B b;
public ABResult getResult()
getA();
getB();
return ABFactory.mix(a,b);
private getA()
a=SomeFactory.getA();
private getB()
b=SomeFactory.getB();
into something like this:
public class Main
public ABResult getResult()
A a=getA();
B b=getB();
return ABFactory.mix(a,b);
private getA()
a=SomeFactory.getA();
private getB()
b=SomeFactory.getB();
but according to the "spirit" of "variables should live in the smallest scope as possible", isn't "never have variables" have smaller scope than "have variables"? So I think the version above should be refactored:
public class Main
public ABResult getResult()
return ABFactory.mix(getA(),getB());
private getA()
a=SomeFactory.getA();
private getB()
b=SomeFactory.getB();
so that getResult() doesn't have any local variables at all. Is that true?
refactoring scope local-variable
asked 4 hours ago
mmmaaammmaaa
2,68741724
add a comment |
According to https://softwareengineering.stackexchange.com/a/388055/248528, variables should live in the smallest scope as possible, simplify the problem into my interpretation, it means we should refactor this kind of code:
public class Main
private A a;
private B b;
public ABResult getResult()
getA();
getB();
return ABFactory.mix(a,b);
private getA()
a=SomeFactory.getA();
private getB()
b=SomeFactory.getB();
into something like this:
public class Main
public ABResult getResult()
A a=getA();
B b=getB();
return ABFactory.mix(a,b);
private getA()
a=SomeFactory.getA();
private getB()
b=SomeFactory.getB();
but according to the "spirit" of "variables should live in the smallest scope as possible", isn't "never have variables" have smaller scope than "have variables"? So I think the version above should be refactored:
public class Main
public ABResult getResult()
return ABFactory.mix(getA(),getB());
private getA()
a=SomeFactory.getA();
private getB()
b=SomeFactory.getB();
so that getResult() doesn't have any local variables at all. Is that true?
refactoring scope local-variable
asked 4 hours ago
mmmaaammmaaa
2,68741724
3
Creating explicit variables comes with the benefit of having to name them. Introducing a few variables can quickly turn an opaque method into a readable one.
– Jared Goguen
3 hours ago
add a comment |
According to https://softwareengineering.stackexchange.com/a/388055/248528, variables should live in the smallest scope as possible, simplify the problem into my interpretation, it means we should refactor this kind of code:
public class Main
private A a;
private B b;
public ABResult getResult()
getA();
getB();
return ABFactory.mix(a,b);
private getA()
a=SomeFactory.getA();
private getB()
b=SomeFactory.getB();
into something like this:
public class Main
public ABResult getResult()
A a=getA();
B b=getB();
return ABFactory.mix(a,b);
private getA()
a=SomeFactory.getA();
private getB()
b=SomeFactory.getB();
but according to the "spirit" of "variables should live in the smallest scope as possible", isn't "never have variables" have smaller scope than "have variables"? So I think the version above should be refactored:
public class Main
public ABResult getResult()
return ABFactory.mix(getA(),getB());
private getA()
a=SomeFactory.getA();
private getB()
b=SomeFactory.getB();
so that getResult() doesn't have any local variables at all. Is that true?
refactoring scope local-variable
asked 4 hours ago
mmmaaammmaaa
2,68741724
According to https://softwareengineering.stackexchange.com/a/388055/248528, variables should live in the smallest scope as possible, simplify the problem into my interpretation, it means we should refactor this kind of code:
public class Main
private A a;
private B b;
public ABResult getResult()
getA();
getB();
return ABFactory.mix(a,b);
private getA()
a=SomeFactory.getA();
private getB()
b=SomeFactory.getB();
into something like this:
public class Main
public ABResult getResult()
A a=getA();
B b=getB();
return ABFactory.mix(a,b);
private getA()
a=SomeFactory.getA();
private getB()
b=SomeFactory.getB();
but according to the "spirit" of "variables should live in the smallest scope as possible", isn't "never have variables" have smaller scope than "have variables"? So I think the version above should be refactored:
public class Main
public ABResult getResult()
return ABFactory.mix(getA(),getB());
private getA()
a=SomeFactory.getA();
private getB()
b=SomeFactory.getB();
so that getResult() doesn't have any local variables at all. Is that true?
refactoring scope local-variable
refactoring scope local-variable
asked 4 hours ago
mmmaaammmaaa
2,68741724
asked 4 hours ago
mmmaaammmaaa
2,68741724
asked 4 hours ago
mmmaaammmaaa
2,68741724
asked 4 hours ago
mmmaaammmaaa
2,68741724
asked 4 hours ago
mmmaaammmaaa
2,68741724
2,68741724
3
Creating explicit variables comes with the benefit of having to name them. Introducing a few variables can quickly turn an opaque method into a readable one.
– Jared Goguen
3 hours ago
add a comment |
3
Creating explicit variables comes with the benefit of having to name them. Introducing a few variables can quickly turn an opaque method into a readable one.
– Jared Goguen
3 hours ago
3
3
Creating explicit variables comes with the benefit of having to name them. Introducing a few variables can quickly turn an opaque method into a readable one.
– Jared Goguen
3 hours ago
Creating explicit variables comes with the benefit of having to name them. Introducing a few variables can quickly turn an opaque method into a readable one.
– Jared Goguen
3 hours ago
add a comment |
1 Answer
1
active
oldest
votes
No. There are several reasons why:
- Variables with meaningful names can make code easier to comprehend.
- Breaking up complex formulas into smaller steps can make the code easier to read.
- Caching.
- Holding references to objects so that they can be used more than once.
And so on.
answered 2 hours ago
Robert HarveyRobert Harvey
166k41380595
1
Also worth mentioning: The value is going to be stored in memory regardless, so it actually ends up with the same scope anyway. May as well name it(for the reasons Robert mentions above)!
– Maybe_Factor
1 hour ago
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
No. There are several reasons why:
- Variables with meaningful names can make code easier to comprehend.
- Breaking up complex formulas into smaller steps can make the code easier to read.
- Caching.
- Holding references to objects so that they can be used more than once.
And so on.
answered 2 hours ago
Robert HarveyRobert Harvey
166k41380595
1
Also worth mentioning: The value is going to be stored in memory regardless, so it actually ends up with the same scope anyway. May as well name it(for the reasons Robert mentions above)!
– Maybe_Factor
1 hour ago
add a comment |
No. There are several reasons why:
- Variables with meaningful names can make code easier to comprehend.
- Breaking up complex formulas into smaller steps can make the code easier to read.
- Caching.
- Holding references to objects so that they can be used more than once.
And so on.
answered 2 hours ago
Robert HarveyRobert Harvey
166k41380595
1
Also worth mentioning: The value is going to be stored in memory regardless, so it actually ends up with the same scope anyway. May as well name it(for the reasons Robert mentions above)!
– Maybe_Factor
1 hour ago
add a comment |
No. There are several reasons why:
- Variables with meaningful names can make code easier to comprehend.
- Breaking up complex formulas into smaller steps can make the code easier to read.
- Caching.
- Holding references to objects so that they can be used more than once.
And so on.
answered 2 hours ago
Robert HarveyRobert Harvey
166k41380595
No. There are several reasons why:
- Variables with meaningful names can make code easier to comprehend.
- Breaking up complex formulas into smaller steps can make the code easier to read.
- Caching.
- Holding references to objects so that they can be used more than once.
And so on.
answered 2 hours ago
Robert HarveyRobert Harvey
166k41380595
edited 2 hours ago
answered 2 hours ago
Robert HarveyRobert Harvey
166k41380595
answered 2 hours ago
Robert HarveyRobert Harvey
166k41380595
answered 2 hours ago
Robert HarveyRobert Harvey
166k41380595
166k41380595
1
Also worth mentioning: The value is going to be stored in memory regardless, so it actually ends up with the same scope anyway. May as well name it(for the reasons Robert mentions above)!
– Maybe_Factor
1 hour ago
add a comment |
1
Also worth mentioning: The value is going to be stored in memory regardless, so it actually ends up with the same scope anyway. May as well name it(for the reasons Robert mentions above)!
– Maybe_Factor
1 hour ago
1
1
Also worth mentioning: The value is going to be stored in memory regardless, so it actually ends up with the same scope anyway. May as well name it(for the reasons Robert mentions above)!
– Maybe_Factor
1 hour ago
Also worth mentioning: The value is going to be stored in memory regardless, so it actually ends up with the same scope anyway. May as well name it(for the reasons Robert mentions above)!
– Maybe_Factor
1 hour ago
add a comment |
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3
Creating explicit variables comes with the benefit of having to name them. Introducing a few variables can quickly turn an opaque method into a readable one.
– Jared Goguen
3 hours ago