daniel-j-dev · daniel-j-dev · Apr 15, 2020 · Apr 15, 2020 · Apr 16, 2020 · Apr 16, 2020
diff --git a/index.js b/index.js
@@ -4,8 +4,9 @@
 /* Create variables for principal, interest rate, and years. Assign them the values 200000, 0.05, and 30 respectively. Create another value called name and give it the value of your own name.
 */
 
-
-
+let principal = 200000;
+let ir = 0.05;
+let years = 30;
 
 
 // 🏡 Task 1.5: Simple Math
@@ -16,7 +17,9 @@ Create a variable called `monthlyInterestRate` and give it the value of interest
 Create another variable called `periods` and give it the value of years*12.
 */
 
+let monthlyInterestRate = ir / 12;
 
+let periods = years * 12;
 
 
 // 🏡 Task 2: Harder Math
@@ -29,7 +32,15 @@ Hint #2: you'll need to use the `math` object for parts of this calculation!
 When your math is correct, monthlyRate will equal 1073.64
 */
 
+let numerator = monthlyInterestRate * Math.pow((1 + monthlyInterestRate),periods);
+
+let denominator = Math.pow(1 + monthlyInterestRate,periods) - 1;
+
+//let monthlyRate = principal * [ monthlyInterestRate * Math.pow( 1 + monthlyInterestRate,periods) ] / [ Math.pow(1 + monthlyInterestRate,periods) - 1 ];
+
+let monthlyRate = principal * (numerator / denominator);
 
+console.log("task 2: " + monthlyRate);
 
 
 // 🏡 Task 3: Function
@@ -38,19 +49,37 @@ When your math is correct, monthlyRate will equal 1073.64
 If your name is `Oscar` mortgageCalculator() should return "Oscar, your monthly rate is 1073.64"
 */
 
+function mortgageCalculator () {
+    console.log("Task 3: Daniel, your monthly rate is " + monthlyRate);
 
+}
+
+mortgageCalculator();
 
 
 
 // 🏡 Task 4: Arguments and Parameters
 /* Substitute the variables in your functions for parameters such that you can substitute `P`, `I`, and `N` when you call the function.
 
 For example,
-mortgageCalculator(2000000, 0.05, 30); <-- should return 1,073.64
+mortgageCalculator(2000000, 0.05, 30); <-- should return 1,073.64 <-- Noticed one extra 0 in P
 */
 
 
+//Stuck right now. Is that calculation given above wrong? //////////////////////////////////////////////////
+
+function mortgageCalculator2 (p, ir, n) {
+
+    let mIR = (ir / 12); //monthly IR
+    mperiod = n*12; //converting number of years to number of months
+
+    let monthlyRate = p * [ mIR * Math.pow( 1 + mIR,mperiod) ] / [ Math.pow(1 + mIR,mperiod) - 1 ];   
+
+    return monthlyRate;
 
+}
+
+console.log("task 4: " + mortgageCalculator2(200000, 0.05, 30));
 
 
 // 🏡 Task 5: Conditionals
@@ -59,7 +88,30 @@ mortgageCalculator(2000000, 0.05, 30); <-- should return 1,073.64
 Then, add control flow within your function such that IF creditScore is above 740, interest rate drops by 0.5%, if credit score is below 660, interest rate increases by 0.5% and if credit score is anywhere between 660 and 740 interest rate doesn't change.
 */
 
+function mortgageCalculator3 (p, ir, n, creditScore) {
+
+    let mIR = (ir / 12); //monthly IR
+    mperiod = n*12; //converting number of years to number of months
+
+    let monthlyRate = p * [ mIR * Math.pow( 1 + mIR,mperiod) ] / [ Math.pow(1 + mIR,mperiod) - 1 ];   
+
+    let newir;
+
+    if (creditScore > 740) {
+
+        newir = ir - (ir*0.05);
+
+    } else if (creditScore<740) {
+
+        newir = ir + (ir*0.05);
+
+    }
 
+    return newir;
+
+}
+
+console.log( "task 5: " + mortgageCalculator3(200000, 0.05, 30, 600));
 
 
 // 🏡 Task 6: Loops
@@ -78,7 +130,24 @@ For example, variableInterestRate(200000, 0.04, 30) should console.log:
 "{Name}, with an interest rate of 0.06, your monthly rate is $1199"
 */
 
+function variableInterestRate (p, ir, n) {
+
+    let i;
+
+    let chngIR = 0;
+
+    for (i=0; i<9; i++) {
+
+
+        chngIR += 0.005; //Change IR amount
+
+        console.log("task 6: Daniel, with an interest rate of " + (ir + chngIR) + " (yearly), your monthly rate is " + mortgageCalculator2(p,(ir+chngIR),n)); //Function inside here returns the monthly rate
+
+    }
+
+}
 
+variableInterestRate(200000, 0.04, 30);
 
 
 // 🌟🌟🌟 STRETCH 🌟🌟🌟//
@@ -95,3 +164,19 @@ For example, variableInterestRate(200000, 0.04, 30) should console.log:
 
 
 /* 🏡  Refactor your `variableInterestRate()` function to accept an array of interest rates (make sure to copy and paste as to not lose your work!) */
+
+let rates = [0.05,0.06,0.07,0.08,0.09,0.1]
+
+function variableInterestRate2 (p, ir, n) {
+
+    let i;
+
+    for (i=0; i<ir.length; i++) {
+
+        console.log("Stretch: Daniel, with an interest rate of " + ir[i] + " (yearly), your monthly rate is " + mortgageCalculator2(p,ir[i],n)); //Function inside here returns the monthly rate
+
+    }
+
+}
+
+variableInterestRate2(200000, rates, 30);