Merge pull request #90 from rkalra247/probelm21

solution and test for problem #21

solutions/21.js

@@ -0,0 +1,35 @@
+// Rahul Kalra
+// Return array of largest 3 values in descending order from a given array
+
+const max = (array) =>{
+  let max = array[0];
+  for(let i = 0; i < array.length; i++){
+    if(max <= array[i+1]){
+      max = array[i+1];
+    }
+  }
+    return max;
+};
+
+const removeNum = (array, max) =>{
+  let newArray = [];
+  for(let i = 0; i < array.length; i++){
+    if(!(max === array[i])){
+      newArray.push(array[i]);
+    }
+  }
+  return newArray;
+};
+
+const solution = (array) =>{
+  let a = 0;
+  let newArray = [];
+  for(let i = 0; i < 3; i++){
+    a = max(array);;
+    array = removeNum(array, a); 
+    newArray.push(a);
+  }
+  return [newArray[0], newArray[1], newArray[2]];
+};
+
+module.exports = {solution};

test/21.js

@@ -0,0 +1,14 @@
+let expect = require('chai').expect;
+let solution = require('../solutions/21').solution;
+
+describe('Return 3 top largest values of an array in a descending order', () =>{
+  it('should return 3 top largest values of an array', () =>{
+    expect(solution([8,1,4,2,12,6,7,19,2,9])).to.eql([19, 12, 9]);
+  });
+});
+
+describe('Return 3 top largest values of an array in a descending order', () =>{
+  it('should return 3 top largest values of an array', () =>{
+       expect(solution([-8,-3,-7,-1,-20,-2])).to.eql([-1,-2,-3]);
+   });
+});