From 0e1011927d28c271f018a79c29d45043d0005730 Mon Sep 17 00:00:00 2001
From: Miguel Prada <mapra99@gmail.com>
Date: Sun, 7 May 2023 14:51:44 -0500
Subject: [PATCH] add ability to do arithmetics with unit classes

---
 src/units/force/force.ts    | 23 +++++++++++------------
 src/units/length/length.ts  |  7 +++----
 src/units/stress/stress.ts  |  7 +++----
 src/units/time/time.ts      |  7 +++----
 src/units/unit/index.ts     |  1 +
 src/units/unit/unit.test.ts | 11 +++++++++++
 src/units/unit/unit.ts      | 13 +++++++++++++
 7 files changed, 45 insertions(+), 24 deletions(-)
 create mode 100644 src/units/unit/index.ts
 create mode 100644 src/units/unit/unit.test.ts
 create mode 100644 src/units/unit/unit.ts

diff --git a/src/units/force/force.ts b/src/units/force/force.ts
index ce7c61d..ef8eed2 100644
--- a/src/units/force/force.ts
+++ b/src/units/force/force.ts
@@ -1,42 +1,41 @@
+import Unit from '../unit';
 import type { ForceUnit } from './types';
 
-class Force {
-  private stdUnit: number;
-
+class Force extends Unit {
   constructor(value: number, unit: ForceUnit) {
-    this.stdUnit = Force.#parseToStd(value, unit);
+    super(Force.#parseToStd(value, unit));
   }
 
   N() {
-    return this.stdUnit;
+    return this.stdValue;
   }
 
   kN() {
-    return this.stdUnit / 1000;
+    return this.stdValue / 1000;
   }
 
   lbf() {
-    return this.stdUnit / 4.448;
+    return this.stdValue / 4.448;
   }
 
   kip() {
-    return this.stdUnit / 4448.222;
+    return this.stdValue / 4448.222;
   }
 
   kgf() {
-    return this.stdUnit / 9.807;
+    return this.stdValue / 9.807;
   }
 
   MN() {
-    return this.stdUnit / 1000000;
+    return this.stdValue / 1000000;
   }
 
   tonf() {
-    return this.stdUnit / 9807;
+    return this.stdValue / 9807;
   }
 
   set(value: number, unit: ForceUnit) {
-    this.stdUnit = Force.#parseToStd(value, unit);
+    this.stdValue = Force.#parseToStd(value, unit);
   }
 
   static #parseToStd(value: number, unit: ForceUnit) {
diff --git a/src/units/length/length.ts b/src/units/length/length.ts
index 0b0fbd9..b06def4 100644
--- a/src/units/length/length.ts
+++ b/src/units/length/length.ts
@@ -1,10 +1,9 @@
+import Unit from '../unit';
 import type { LengthUnit } from './types';
 
-class Length {
-  private stdValue: number;
-
+class Length extends Unit {
   constructor(value: number, unit: LengthUnit) {
-    this.stdValue = Length.#parseToStd(value, unit);
+    super(Length.#parseToStd(value, unit));
   }
 
   mm() {
diff --git a/src/units/stress/stress.ts b/src/units/stress/stress.ts
index f3358f4..daf9207 100644
--- a/src/units/stress/stress.ts
+++ b/src/units/stress/stress.ts
@@ -1,10 +1,9 @@
+import Unit from '../unit';
 import type { StressUnit } from './types';
 
-class Stress {
-  private stdValue: number;
-
+class Stress extends Unit {
   constructor(value: number, unit: StressUnit) {
-    this.stdValue = Stress.#parseToStd(value, unit);
+    super(Stress.#parseToStd(value, unit));
   }
 
   MPa() {
diff --git a/src/units/time/time.ts b/src/units/time/time.ts
index 5c274d4..ba5533e 100644
--- a/src/units/time/time.ts
+++ b/src/units/time/time.ts
@@ -1,10 +1,9 @@
+import Unit from '../unit';
 import type { TimeUnit } from './types';
 
-class Time {
-  private stdValue: number;
-
+class Time extends Unit {
   constructor(value: number, unit: TimeUnit) {
-    this.stdValue = Time.#parseToStd(value, unit);
+    super(Time.#parseToStd(value, unit));
   }
 
   ms() {
diff --git a/src/units/unit/index.ts b/src/units/unit/index.ts
new file mode 100644
index 0000000..38e96d6
--- /dev/null
+++ b/src/units/unit/index.ts
@@ -0,0 +1 @@
+export { default } from './unit';
diff --git a/src/units/unit/unit.test.ts b/src/units/unit/unit.test.ts
new file mode 100644
index 0000000..edc20e9
--- /dev/null
+++ b/src/units/unit/unit.test.ts
@@ -0,0 +1,11 @@
+import Unit from '.';
+
+describe('Unit', () => {
+  const something = new Unit(100);
+
+  describe('valueOf', () => {
+    it('returns the stdValue', () => {
+      expect(something.valueOf()).toBe(100);
+    });
+  });
+});
diff --git a/src/units/unit/unit.ts b/src/units/unit/unit.ts
new file mode 100644
index 0000000..3e08567
--- /dev/null
+++ b/src/units/unit/unit.ts
@@ -0,0 +1,13 @@
+class Unit {
+  stdValue: number;
+
+  constructor(value: number) {
+    this.stdValue = value;
+  }
+
+  valueOf() {
+    return this.stdValue;
+  }
+}
+
+export default Unit;