'Convert for loop with a return statement to stream and filter lambda statement [duplicate]

How can I convert the below for loop with return statement to a lambda expression or stream with filter.

for(PhysicianData d : physicianDataList)
    {
        if(d.getPhysicianName().equals(physicianName))
        {
            return true;
        }
    }
javajava-8java-stream


Solution 1:[1]

Use anyMatch()

boolean result = physicianDataList.stream()
            .map(PhysicianData::getPhysicianName) // Stream of names
            .filter(Objects::nonNull) //Skip nulls
            .anyMatch(name -> name.equals(physicianName));

Solution 2:[2]

Since you're looking for anything that matches the name equality check (anything being the operative word), I suggest having a look at the Stream::anyMatch() method, as well as its other counterparts of Stream::allMatch() and Stream::noneMatch(). The above code can be rewritten as:

boolean result = physicianDataList
    .stream()
    .anyMatch(physicianData -> physicianData.getPhysicianName().equals(physicianName);

Solution 3:[3]

Use it:

    class PhysicianData {
    String physicianName;

    public void setPhysicianName(final String physicianName) {
        this.physicianName = physicianName;
    }

    public String getPhysicianName() {
        return physicianName;
    }
}

@Test
void test() {
    PhysicianData one = new PhysicianData();
    one.setPhysicianName("A");
    PhysicianData two = new PhysicianData();
    two.setPhysicianName("B");
    List<PhysicianData> physicianDataList = List.of(one, two);
    assertEquals(forMethod("A", physicianDataList), streamMethode("A", physicianDataList));
}

private boolean forMethod(final String physicianName, final List<PhysicianData> physicianDataList) {
    for (PhysicianData d : physicianDataList) {
        if (d.getPhysicianName().equals(physicianName)) {
            return true;
        }
    }
    return false;
}

private boolean streamMethode(final String physicianName, final List<PhysicianData> physicianDataList) {
    return physicianDataList.stream().anyMatch(x-> x.getPhysicianName().equals(physicianName));
}

Solution 4:[4]

Try using anyMatch() that takes a predicate as an argument

boolean isFound = physicianDataList.stream()
             .anyMatch(d -> d.getPhysicianName().equals(physicianName));

Sources

This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.

Source: Stack Overflow

Solution Source
Solution 1
Solution 2 Ramen Dev
Solution 3 Maxim Bezmen
Solution 4 Bentaye

Related Questions