Replace For-Loop with Stream::Match

Description

Replaces occurrences of enhanced for-loops which are only used to initialize or return a boolean variable with Stream::anyMatch, Stream::allMatch or Stream::noneMatch. The stream syntax is more concise and improves readability.

Benefits

Applying this rule results in better readability.

Tags

Tags

Java 8, Lambda, Loop

Code Changes

Loop with break statement to Stream::anyMatch

Pre

boolean containsEmpty = false;
for(String value : strings) {
    if(value.isEmpty()) {
        containsEmpty = true;
        break;
    }
}

Post

boolean containsEmpty = strings.stream().anyMatch(value -> value.isEmpty());

Loop with break statement to Stream::noneMatch

Pre

boolean noneEmpty = true;
for(String value : strings) {
    if(value.isEmpty()) {
        noneEmpty = false;
        break;
    }
}

Post

boolean noneEmpty = strings.stream().noneMatch(value -> value.isEmpty());

Loop with break statement to Stream::allMatch

Pre

boolean allEmpty = true;
for(String value : strings) {
    if(!value.isEmpty()) {
        containsEmpty = false;
        break;
    }
}

Post

boolean allEmpty = strings.stream().allMatch(value -> value.isEmpty());

Loop with return statement

Pre

for(String value : strings) {
    if(emptyString.equals(value)) {
        return true;
    }
}
return false

Post

return strings.stream().anyMatch(value -> emptyString.equals(value));

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Properties

Property	Value
Rule ID	EnhancedForLoopToStreamAnyMatch
First seen in jSparrow version	2.2.0
Minimum Java version	8
Remediation cost	2 min