TheAlgorithms · Hyraze · Oct 5, 2023 · Oct 5, 2023
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+/**
+ * Speed conversion
+ *
+ * This function converts speed units including kilometers per hour (km/h),
+ * meters per second (m/s), miles per hour (mph), and knots (knot).
+ *
+ * https://en.wikipedia.org/wiki/Kilometres_per_hour
+ * https://en.wikipedia.org/wiki/Miles_per_hour
+ * https://en.wikipedia.org/wiki/Metre_per_second
+ * https://en.wikipedia.org/wiki/Knot_(unit)
+ *
+ * chart for unit conversions.
+ *
+ * @constant {Object} speedChart
+ * @property {number} speedChart['km/h'] - Conversion factor for kilometers per hour (km/h).
+ * @property {number} speedChart['m/s'] - Conversion factor for meters per second (m/s).
+ * @property {number} speedChart['mph'] - Conversion factor for miles per hour (mph).
+ * @property {number} speedChart['knot'] - Conversion factor for knots (knot).
+ */
+const speedChart = {
+  'km/h': 1.0,
+  'm/s': 3.6,
+  mph: 1.609344,
+  knot: 1.852
+}
+
+/**
+ * Inverse speed conversion chart for unit conversions.
+ *
+ * @constant {Object} speedChartInverse
+ * @property {number} speedChartInverse['km/h'] - Inverse conversion factor for kilometers per hour (km/h).
+ * @property {number} speedChartInverse['m/s'] - Inverse conversion factor for meters per second (m/s).
+ * @property {number} speedChartInverse['mph'] - Inverse conversion factor for miles per hour (mph).
+ * @property {number} speedChartInverse['knot'] - Inverse conversion factor for knots (knot).
+ */
+const speedChartInverse = {
+  'km/h': 1.0,
+  'm/s': 0.277777778,
+  mph: 0.621371192,
+  knot: 0.539956803
+}
+
+/**
+ * Convert speed from one unit to another using the speedChart and speedChartInverse.
+ *
+ * @param {number} speed - The speed value to be converted.
+ * @param {string} inputUnit - The source unit (e.g., 'km/h', 'm/s', 'mph', 'knot').
+ * @param {string} outputUnit - The target unit (e.g., 'km/h', 'm/s', 'mph', 'knot').
+ * @throws {Error} Throws an error if the source or target unit is not recognized.
+ * @returns {number} The converted speed value.
+ */
+const convertSpeed = (speed, inputUnit, outputUnit) => {
+  if (!(outputUnit in speedChart) || !(inputUnit in speedChartInverse)) {
+    const validUnits = Object.keys(speedChartInverse).join(', ')
+    throw new Error(
+      `Incorrect 'inputUnit' or 'outputUnit' value: ${inputUnit}, ${outputUnit}\n Valid values are: ${validUnits}`
+    )
+  }
+
+  return parseFloat(
+    (speed * speedChart[inputUnit] * speedChartInverse[outputUnit]).toFixed(3)
+  )
+}
+
+export { convertSpeed }
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+import { convertSpeed } from '../SpeedConversion'
+
+describe('Speed Unit Conversions', () => {
+  it('100 km/h to m/s', () => {
+    expect(convertSpeed(100, 'km/h', 'm/s')).toBe(27.778, 3)
+  })
+
+  it('100 km/h to mph', () => {
+    expect(convertSpeed(100, 'km/h', 'mph')).toBe(62.137, 3)
+  })
+
+  it('100 km/h to knot', () => {
+    expect(convertSpeed(100, 'km/h', 'knot')).toBe(53.996, 3)
+  })
+
+  it('100 m/s to km/h', () => {
+    expect(convertSpeed(100, 'm/s', 'km/h')).toBe(360.0, 3)
+  })
+
+  it('100 m/s to mph', () => {
+    expect(convertSpeed(100, 'm/s', 'mph')).toBe(223.694, 3)
+  })
+
+  it('100 m/s to knot', () => {
+    expect(convertSpeed(100, 'm/s', 'knot')).toBe(194.384, 3)
+  })
+
+  it('100 mph to km/h', () => {
+    expect(convertSpeed(100, 'mph', 'km/h')).toBe(160.934, 3)
+  })
+
+  it('100 mph to m/s', () => {
+    expect(convertSpeed(100, 'mph', 'm/s')).toBe(44.704, 3)
+  })
+
+  it('100 mph to knot', () => {
+    expect(convertSpeed(100, 'mph', 'knot')).toBe(86.898, 3)
+  })
+
+  it('100 knot to km/h', () => {
+    expect(convertSpeed(100, 'knot', 'km/h')).toBe(185.2, 3)
+  })
+
+  it('100 knot to m/s', () => {
+    expect(convertSpeed(100, 'knot', 'm/s')).toBe(51.444, 3)
+  })
+
+  it('100 knot to mph', () => {
+    expect(convertSpeed(100, 'knot', 'mph')).toBe(115.078, 3)
+  })
+})