:tada: first commit | container and interface functions

index.js

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+const US_LIQUID_GALLONS_TO_CUBIC_INCHES = 231
+const CUBIC_INCHES_TO_US_LIQUID_GALLONS = 1 / US_LIQUID_GALLONS_TO_CUBIC_INCHES
+
+const toLiquid = cubicInches => cubicInches * CUBIC_INCHES_TO_US_LIQUID_GALLONS
+const fromLiquid = gallons => gallons * US_LIQUID_GALLONS_TO_CUBIC_INCHES
+
+class Container {
+    constructor({ l, w, h }, level = 0) {
+        this.l = l
+        this.w = w
+        this.h = h
+        this.level = level
+    }
+    get liquidVolumeCapacity() {
+        return toLiquid(this.l * this.w * this.h)
+    }
+    get liquidVolumeFilled() {
+        return toLiquid(this.l * this.w * this.level)
+    }
+    get liquidVolumeRemaining() {
+        return this.liquidVolumeCapacity - this.liquidVolumeFilled
+    }
+}
+
+/** Functional Core */
+const _changeLevel = (amount, container) => {
+    const alteredLevel =
+        fromLiquid(container.liquidVolumeFilled + amount) /
+        container.l /
+        container.w
+    return createContainer(container, alteredLevel)
+}
+const createContainer = ({ l, w, h }, level) => {
+    if (Math.sign(l) + Math.sign(w) + Math.sign(h) !== 3)
+        return console.error(
+            `[Error] All dimensions must be positive and greater than zero!`
+        )
+    return new Container({ l, w, h }, level)
+}
+const fill = ({ container, amount }) => _changeLevel(amount, container)
+const drain = ({ container, amount }) => _changeLevel(-1 * amount, container)
+
+myTank = createContainer({ l: 12, w: 12, h: 12 })
+console.log('capacity:', myTank.liquidVolumeCapacity)
+console.log('filled:', myTank.liquidVolumeFilled)
+
+myTank = fill({ amount: myTank.liquidVolumeCapacity, container: myTank })
+console.log('\nremaining liquid volume:', myTank.liquidVolumeRemaining)
+console.log('remain h:', myTank.h - myTank.level)
+
+myTank = drain({ amount: 4, container: myTank })
+console.log('\nremaining liquid volume:', myTank.liquidVolumeRemaining)
+console.log('remain h:', myTank.h - myTank.level)
+console.log('filled:', myTank.liquidVolumeFilled)
+
+myTank = fill({ amount: 3, container: myTank })
+console.log('\nremaining liquid volume:', myTank.liquidVolumeRemaining)
+console.log('remain h:', myTank.h - myTank.level)
+console.log('filled:', myTank.liquidVolumeFilled)

package.json

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+{
+  "name": "level",
+  "version": "1.0.0",
+  "description": "liquid measurement",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "author": "TOJ",
+  "license": "UNLICENSED"
+}