[BUGFIX] SonarQube: Do not call Array#push() multiple times.

Multiple consecutive calls to methods that accept multiple arguments should be combined javascript:S7778

Author: Gonzalo Diaz

src/hackerrank/warmup/plusMinus.js

@@ -17,11 +17,11 @@ function plusMinus(arr) {
     }
   }
 
-  const result = [];
-
-  result.push((positives / arr.length).toFixed(6));
-  result.push((negatives / arr.length).toFixed(6));
-  result.push((zeros / arr.length).toFixed(6));
+  const result = [
+    (positives / arr.length).toFixed(6),
+    (negatives / arr.length).toFixed(6),
+    (zeros / arr.length).toFixed(6)
+  ];
 
   return result.join(`\n`);
 }