Add Business Tax

[inverse-tax] / tax_ui.js

diff --git a/tax_ui.js b/tax_ui.js
index 4f2b625d47311f1554860c97c0abd0460376f5eb..d71de9fc36adfa167202de68820ee5e806a6ec47 100644 (file)
--- a/tax_ui.js
+++ b/tax_ui.js
@@ -1,6 +1,8 @@
-function load_tax_table(table_id, deductible_id) {
-  return apply_deductible(parse_tax_table(document.getElementById(table_id).value),
-                          parseFloat(document.getElementById(deductible_id).value));
+"use strict";
+
+function load_tax_table(table_id, deductible_id = null) {
+  const deductible = deductible_id == null ? 0.0 : parseFloat(document.getElementById(deductible_id).value);
+  return apply_deductible(parse_tax_table(document.getElementById(table_id).value), deductible);
 }
 
 function format_number(n) {
@@ -8,17 +10,24 @@ function format_number(n) {
 }
 
 function calculate() {
-  const table1 = load_tax_table('tax_table_1', 'deductible_1');
-  const table2 = load_tax_table('tax_table_2', 'deductible_2');
+  const tax_tables = [
+    load_tax_table('tax_table_1', 'deductible_1'),
+    load_tax_table('tax_table_2', 'deductible_2'),
+    load_tax_table('tax_table_3'),
+    load_tax_table('tax_table_4'),
+    load_tax_table('tax_table_5')
+  ];
   const after_tax = parseFloat(document.getElementById('after_tax').value);
 
-  const before_tax = invert(merge_tax_tables(table1, table2))(after_tax);
-
-  const tax1 = tax(table1, before_tax);
-  const tax2 = tax(table2, before_tax);
+  const merged_tax_table = tax_tables.reduce(merge_tax_tables);
+  const before_tax = invert(merged_tax_table)(after_tax);
+  const taxes = tax_tables.map(t => tax(t, before_tax));
 
   document.getElementById('before_tax').textContent = format_number(before_tax);
-  document.getElementById('tax_1').textContent = format_number(tax1);
-  document.getElementById('tax_2').textContent = format_number(tax2);
-  document.getElementById('after_tax_verification').textContent = format_number(before_tax - (tax1 + tax2));
+  document.getElementById('tax_1').textContent = format_number(taxes[0]);
+  document.getElementById('tax_2').textContent = format_number(taxes[1]);
+  document.getElementById('tax_3').textContent = format_number(taxes[2]);
+  document.getElementById('tax_4').textContent = format_number(taxes[3]);
+  document.getElementById('tax_5').textContent = format_number(taxes[4]);
+  document.getElementById('after_tax_verification').textContent = format_number(before_tax - sum(taxes));
 }