Adding solution and test for issue 128

solutions/128.js

@@ -0,0 +1,34 @@
+//Natalie Lockhart
+//Multiply two numbers without using *
+
+const solution = (x, y) => {
+  function multiply(x,y){
+	  result += Math.abs(y);
+	  counter++;
+
+	  if(counter == Math.abs(x)){
+	    return result;
+	  }
+	  multiply(x,y);
+  }
+
+  if(x == 0 || y == 0){
+    return 0;
+  }
+
+  var counter = 0;
+  var result = 0;
+  multiply(x,y);
+
+  //If one of the two numbers is negative, make the result negative
+  if ((Math.abs(x) != x || Math.abs(y) != y) && !(Math.abs(x) != x && Math.abs(y) != y)){
+    result = 0 - result;
+  }
+
+  return result;
+
+};
+
+module.exports = {
+  solution,
+};

test/128.js

@@ -0,0 +1,25 @@
+const expect = require('chai').expect;
+let solution = require('../solutions/128.js').solution;
+
+describe('Multiply two numbers without using *', () => {
+  it('should return 0 for 10,0', () => {
+    const result = solution(10,0);
+    expect(result).to.equal(0);
+  });
+  it('should return 3 for 1,3', () => {
+    const result = solution(1,3);
+    expect(result).to.equal(3);
+  });
+  it('should return 60 for 6,10', () => {
+    const result = solution(6,10);
+    expect(result).to.equal(60);
+  });
+  it('should return -100 for 10,-10', () => {
+    const result = solution(10,-10);
+    expect(result).to.equal(-100);
+  });
+  it('should return 25 for -5,-5', () => {
+    const result = solution(-5,-5);
+    expect(result).to.equal(25);
+  });
+});