Advanced Array Manipulations in TypeScript - #10 #AdvancedArrayManipulations #TypeScriptArrays

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Advanced array manipulations in TypeScript involve using a combination of array methods, generics, and type annotations to perform complex operations while ensuring type safety. Here are some advanced techniques you can use:

1. Type-Safe Mapping
Using generics and type annotations, you can create type-safe transformations of arrays:

typescript
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function mapArray T, U (arr: T[], mapper: (item: T) =  U): U[] {
   return arr.map(mapper);
}

const numbers: number[] = [1, 2, 3];
const squaredNumbers: number[] = mapArray(numbers, num = num * num);
console.log(squaredNumbers); // Output: [1, 4, 9]
2. Filtering Arrays with Type Predicates
You can define type predicates to filter arrays based on specific conditions:

typescript
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interface Animal {
   name: string;
   age: number;
}

function isOlderThanFive(animal: Animal): boolean {
   return animal.age  5;
}

const animals: Animal[] = [
   { name: "Dog", age: 3 },
   { name: "Cat", age: 7 },
   { name: "Rabbit", age: 4 }
];

const oldAnimals: Animal[] = animals.filter(isOlderThanFive);
console.log(oldAnimals); // Output: [{ name: "Cat", age: 7 }]
3. Flattening Nested Arrays
You can flatten nested arrays using flatMap():

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const nestedArrays: number[][] = [[1, 2], [3, 4], [5, 6]];
const flattenedArray: number[] = nestedArrays.flatMap(arr = arr);
console.log(flattenedArray); // Output: [1, 2, 3, 4, 5, 6]
4. Reducing Arrays with Type Safety
You can use reduce() with generics to reduce arrays while maintaining type safety:

typescript
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function sumArray T extends number[] (arr: T): number {
   return arr.reduce((acc, curr) = acc + curr, 0);
}

const numbers: number[] = [1, 2, 3, 4, 5];
const sum: number = sumArray(numbers);
console.log(sum); // Output: 15
5. Grouping Arrays by Criteria
You can group arrays based on specific criteria using reduce():

typescript
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interface Person {
   name: string;
   age: number;
}

const people: Person[] = [
   { name: "Alice", age: 25 },
   { name: "Bob", age: 30 },
   { name: "Charlie", age: 25 }
];

const groupedByAge: Map number, Person[]  = people.reduce((acc, person) =  {
   const groupKey = person.age;
   const group = acc.get(groupKey) || [];
   group.push(person);
   acc.set(groupKey, group);
   return acc;
}, new Map number, Person[] ());

console.log(groupedByAge);
// Output:
// Map(2) {
//   25 =  [ { name: 'Alice', age: 25 }, { name: 'Charlie', age: 25 } ],
//   30 = [ { name: 'Bob', age: 30 } ]
// }
These advanced techniques allow you to manipulate arrays in TypeScript with confidence, leveraging the language's type system to catch errors at compile-time and write more maintainable code.

Chapter :
00:00 Introduction
00:15 Type-Safe Mapping
00:54 Filtering Arrays with Type Predicates
01:23 Flattening Nested Arrays
01:44 Reducing Arrays with Type Safety
02:05 Grouping Arrays by Criteria
02:27 Summery

Thank you for watching this video
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