Merge pull request mouredev#3780 from hozlucas28/Solution-21-TypeScript

#21 - TypeScript

Author: Roswell468

Roadmap/21 - CALLBACKS/typescript/hozlucas28.ts

@@ -0,0 +1,103 @@
+/*
+    Callbacks...
+*/
+
+console.log('Callbacks...')
+
+function createArray<T extends number | string>(
+    length: number,
+    callback: (prevElement: undefined | T) => T
+): T[] {
+    const array: T[] = []
+
+    for (let i = 0; i < length; i++) {
+        const element: T = callback(array.at(i - 1))
+        array.push(element)
+    }
+
+    return array
+}
+
+const arrayOfEvens: number[] = createArray<number>(10, (prevElement) => {
+    if (typeof prevElement === 'undefined') return 0
+    return prevElement + 2
+})
+
+console.log(`\nArray of evens: [${arrayOfEvens}]`)
+
+const arrayOfOdds: string[] = createArray<string>(10, (prevElement) => {
+    if (typeof prevElement === 'undefined') return 'I am the number 1'
+
+    const prevElementValue = parseInt(
+        prevElement.slice(prevElement.lastIndexOf(' '))
+    )
+
+    return `I am the number ${prevElementValue + 2}`
+})
+
+console.log(`\nArray of named odds: [${arrayOfOdds}]`)
+
+console.log(
+    '\n# ---------------------------------------------------------------------------------- #\n'
+)
+
+/*
+    Additional challenge...
+*/
+
+console.log('Additional challenge...\n')
+
+interface RestaurantParams<T extends string = string> {
+    name: T
+    onConfirm(dishName: T): Promise<void>
+    onReady(dishName: T): void
+    onDeliver(dishName: T): Promise<void>
+}
+
+async function prepareDish({
+    name,
+    onConfirm,
+    onReady,
+    onDeliver,
+}: RestaurantParams): Promise<void> {
+    await onConfirm(name)
+
+    const randomTimeout: number =
+        Math.max(Math.ceil(Math.random() * 10), 1) * 1000
+
+    await new Promise((resolve) =>
+        setTimeout(() => {
+            onReady(name)
+            resolve(null)
+        }, randomTimeout)
+    )
+
+    await onDeliver(name)
+}
+
+Promise.all([
+    prepareDish({
+        name: 'Spaghetti',
+        async onConfirm(dishName) {
+            console.log(`${dishName} in preparation.`)
+        },
+        onReady(dishName) {
+            console.log(`${dishName} is ready to deliver.`)
+        },
+        async onDeliver(dishName) {
+            console.log(`${dishName} delivered.`)
+        },
+    }),
+    prepareDish({
+        name: 'Soup',
+        async onConfirm(dishName) {
+            console.log(`${dishName} in preparation.`)
+        },
+        onReady(dishName) {
+            console.log(`${dishName} is ready to deliver.`)
+        },
+        async onDeliver(dishName) {
+            console.log(`${dishName} delivered.`)
+        },
+    }),
+])