[java] [student_grades] Lambda expression refactor

JavierCane · JavierCane · commit 10a6cf5bef04 · 2020-09-23T12:17:50.000+02:00
diff --git a/examples/java/java-student_grades-02_extract_method/src/main/java/tv/codely/student_grades/StudentGradeCalculator.java b/examples/java/java-student_grades-02_extract_method/src/main/java/tv/codely/student_grades/StudentGradeCalculator.java
@@ -63,11 +63,7 @@ private float gradesSum(List<Pair<Integer, Float>> examsGrades) {
     }
 
     private int gradesWeightSum(List<Pair<Integer, Float>> examsGrades) {
-        int gradesWeightSum = 0;
-        for (Pair<Integer, Float> examGrade : examsGrades) {
-            gradesWeightSum += examGrade.first();
-        }
-        return gradesWeightSum;
+        return examsGrades.stream().map(Pair::first).reduce(Integer::sum).get();
     }
 
     private boolean hasToIncreaseOneExtraPoint() {

Original file line number	Diff line number	Diff line change
`@@ -63,11 +63,7 @@ private float gradesSum(List<Pair<Integer, Float>> examsGrades) {`
`63`	`63`	`}`
`64`	`64`
`65`	`65`	`private int gradesWeightSum(List<Pair<Integer, Float>> examsGrades) {`
`66`		`- int gradesWeightSum = 0;`
`67`		`- for (Pair<Integer, Float> examGrade : examsGrades) {`
`68`		`- gradesWeightSum += examGrade.first();`
`69`		`- }`
`70`		`- return gradesWeightSum;`
	`66`	`+ return examsGrades.stream().map(Pair::first).reduce(Integer::sum).get();`
`71`	`67`	`}`
`72`	`68`
`73`	`69`	`private boolean hasToIncreaseOneExtraPoint() {`