https://github.com/helpermethod/idiomatic-groovy
https://github.com/helpermethod/idiomatic-groovy
Last synced: 3 months ago
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- Host: GitHub
- URL: https://github.com/helpermethod/idiomatic-groovy
- Owner: helpermethod
- Created: 2016-09-30T08:27:38.000Z (over 8 years ago)
- Default Branch: master
- Last Pushed: 2016-11-23T16:37:00.000Z (over 8 years ago)
- Last Synced: 2025-02-05T03:32:30.897Z (5 months ago)
- Size: 10.7 KB
- Stars: 0
- Watchers: 3
- Forks: 1
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
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README
# Idiomatic Groovy
## General
* Omit semicolons
```groovy
// bad
def number = 1;
// good
def number = 1
```
* Omit parentheses for single method calls
```groovy
// bad
println('Hello World!')
// good
println 'Hello World!'
```
* Use parentheses for chained method calls
## Strings
* Use string interpolation for concatenation
```groovy
def lang = 'Groovy'
// bad
println lang + ' rocks!'
// good
println "$lang rocks!"
```
* Use triple-quotes for multiline strings
```groovy
```
## Collections
* Use the `-` operator for removing all instances of an element
```groovy
// bad
['a', null, 'b', null, 'c'].removeAll { it == null }
// better
['a', null, 'b', null, 'c'].findAll { it != null }
// good
['a', null, 'b', null, 'c'] - null
```
* Use the `+` operator for concatenation
```groovy
// bad
def l = ['a', 'b', 'c']
l.addAll ['d', 'e', 'f']
// good
l + ['d', 'e', 'f']
```
## Functional Programming
* Use `findAll` for filtering collections
```groovy
// bad
def result = []
for (c in [1, 2, 3, 4]) {
if (c % 2 == 0) {
result << c
}
}
// good
[1, 2, 3, 4].findAll {
it % 2 == 0
}
```
* Use `collect` to apply a function to every element of a collection
```groovy
// bad
def result = []
for (c in ['a', 'b', 'c']) {
result << c.toUpperCase()
}
// better
['a', 'b', 'c'].collect { it.toUpperCase() }
// good
['a', 'b', 'c']*.toUpperCase()
```