Done

index.js

@@ -0,0 +1,53 @@
+function add(a,b){
+ return a+b
+}
+function subtract(a,b){
+  return a-b
+}
+function divide(a,b){
+  return a/b
+}
+function multiply(a,b){
+  return a*b
+}
+function increment(a){
+  return a += 1
+}
+function decrement(a){
+  return a -= 1
+}
+function makeInt(string){
+  return parseInt(string,10)
+}
+function preserveDecimal(string){
+  return parseFloat(string)
+}
+
+
+
+
+
+
+describe('makeInt(n)', function() {
+  it('parses n as an integer and returns the parsed integer', function() {
+    expect(makeInt(a.toString())).toEqual(a)
+  })
+
+  it('assumes base 10', function() {
+    expect(makeInt('0x2328')).toEqual(0)
+  })
+
+  it('returns NaN as appropriate', function() {
+    expect(isNaN(makeInt('sldkjflksjf'))).toEqual(true)
+  })
+})
+
+describe('preserveDecimal(n)', function() {
+  it('preserves n\'s decimals (it parses n as a floating point number) and returns the parsed number', function() {
+    expect(preserveDecimal('2.222')).toBe(2.222)
+  })
+
+  it('returns NaN as appropriate', function() {
+    expect(isNaN(preserveDecimal('sldkjflksjf'))).toEqual(true)
+  })
+})