Adjust examples

Author: jessealama

examples/bill.js

@@ -4,14 +4,11 @@ const zero = new Decimal128("0");
 const one = new Decimal128("1");
 
 function calculateBill(items, tax) {
-    let taxRate = Decimal128.add(new Decimal128(tax), one);
+    let taxRate = new Decimal128(tax).add(one);
     let total = items.reduce((total, { price, count }) => {
-        return Decimal128.multiply(
-            Decimal128.add(total, new Decimal128(price)),
-            new Decimal128(count)
-        );
+        return total.add(new Decimal128(price).multiply(new Decimal128(count)));
     }, zero);
-    return Decimal128.multiply(total, taxRate);
+    return total.multiply(taxRate);
 }
 
 const items = [

examples/floor.js

@@ -0,0 +1,3 @@
+function floor(d) {
+    return d.round(0, "floor");
+}

examples/mortgage.js

@@ -8,20 +8,17 @@ function calculateMonthlyPayment(p, r, y) {
     let principal = new Decimal128(p);
     let annualInterestRate = new Decimal128(r);
     let years = new Decimal128(y);
-    const monthlyInterestRate = Decimal128.divide(
-        annualInterestRate,
-        paymentsPerYear
-    );
-    const paymentCount = Decimal128.multiply(paymentsPerYear, years);
-    const onePlusInterestRate = Decimal128.add(one, monthlyInterestRate);
+    const monthlyInterestRate = annualInterestRate.divide(paymentsPerYear);
+    const paymentCount = paymentsPerYear.multiply(years);
+    const onePlusInterestRate = monthlyInterestRate.add(one);
     const ratePower = pow(onePlusInterestRate, paymentCount);
 
-    let x = Decimal128.multiply(principal, monthlyInterestRate);
-    let numerator = Decimal128.multiply(x, ratePower);
+    let x = principal.multiply(monthlyInterestRate);
+    let numerator = x.multiply(ratePower);
 
-    let denominator = Decimal128.subtract(ratePower, one);
+    let denominator = ratePower.subtract(one);
 
-    return Decimal128.divide(numerator, denominator);
+    return numerator.divide(denominator);
 }
 
 console.log(calculateMonthlyPayment("5000000", "0.05", "30").toString());

examples/step.js

@@ -11,4 +11,4 @@ function stepUp(d, n, x) {
 
 let starting = new Decimal128("1.23");
 let stepped = stepUp(starting, new Decimal128("3"), new Decimal("-4"));
-console.log(stepped.toFixed(4)); // 1.2305
+console.log(stepped.toString({ numDecimalDigits: 4 })); // 1.2305