typescript tutorial: comprehensive guide

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typescript tutorial: comprehensive guide 1. introduction to typescript what is typescript? typescript is a superset of javascript that adds static typing and other features to make large-scale applications more manageable. it compiles down to plain javascript, making it compatible with any browser or javascript runtime. why use typescript? static typing : catch errors during development rather than at runtime. enhanced tooling : better autocompletion, refactoring, and error detection in ides like vs code. scalability : ideal for large projects with complex codebases. compatibility : fully interoperable with existing javascript code. setting up typescript install node.js (if not already installed). install typescript globally: npm install -g typescript verify installation: tsc --version create a tsconfig.json file: tsc --init 2. basic concepts 2.1 variables and types declare variables with explicit types: let name: string = "alice"; let age: number = 25; let isstudent: boolean = true; type inference: let username = "bob"; // …

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are ideal when you need a collection of items of the same type, especially when the size of the collection is not fixed. 2.3 tuples what are tuples? tuples are fixed-size arrays where each element has a specific type. unlike arrays, tuples enforce both the order and the type of elements. key characteristics fixed size : the length of a tuple is fixed at the time of declaration. example: let person: [string, number] = ["alice", 25]; here, person must always contain exactly two elements: a string followed by a number. specific types for each position : each position in a tuple has a specific type that cannot be changed. example: let coordinates: [number, number] = [10, 20]; coordinates[0] = 15; // valid coordinates[1] = "hello"; // error: type 'string' is not assignable to type 'number'. index-based access : like arrays, tuple elements are accessed using their index. example: let rgb: …

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g, number] = ["alice", 25]; person[0] = "bob"; // valid person[1] = 30; // valid console.log(person); // output: ["bob", 30] // adding extra elements to a tuple is not allowed person.push("extra"); // allowed, but not recommended console.log(person); // output: ["bob", 30, "extra"] (not ideal) conclusion arrays are more flexible and suited for collections of items where the size and types may vary. tuples are stricter and better suited for small, fixed-size collections where the order and type of elements are important. 2.4 enums define a set of named constants: enum color { red, green, blue, } let favoritecolor: color = color.blue; 2.5 any and unknown any: allows any type (use sparingly): let randomvalue: any = 42; randomvalue = "hello"; unknown: safer alternative to any: let unknownvalue: unknown = 42; if (typeof unknownvalue === "number") { console.log(unknownvalue.tofixed(2)); } 3. functions 3.1 function declarations add types to parameters and return values: function …

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5.1 class basics define classes with properties and methods: class person { name: string; age: number; constructor(name: string, age: number) { this.name = name; this.age = age; } greet(): string { return `hi, my name is ${this.name}`; } } 5.2 access modifiers use public, private, and protected: class car { private speed: number; constructor(speed: number) { this.speed = speed; } getspeed(): number { return this.speed; } } 5.3 inheritance extend classes: class animal { move(): void { console.log("moving..."); } } class dog extends animal { bark(): void { console.log("woof!"); } } 6. generics 6.1 generic functions create reusable functions with type parameters: function identity (arg: t): t { return arg; } const output = identity ("hello"); 6.2 generic classes define generic classes: class box { contents: t; constructor(value: t) { this.contents = value; } } const box = new box (42); 7. advanced topics 7.1 union and intersection types combine …

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mple: class dog { bark(): void { console.log("woof!"); }} class cat { meow(): void { console.log("meow!"); }} function makesound(animal: dog | cat): void { if (animal instanceof dog) { animal.bark(); } else if (animal instanceof cat) { animal.meow();}} const mydog = new dog(); const mycat = new cat(); makesound(mydog); // output: woof! makesound(mycat); // output: meow! custom type guards : define custom logic to narrow types using functions that return a boolean. example: interface bird { type: "bird"; flyingspeed: number; } interface horse { type: "horse"; runningspeed: number; } type animal = bird | horse; function isbird(animal: animal): animal is bird { return (animal as bird).flyingspeed !== undefined; } function moveanimal(animal: animal): void { if (isbird(animal)) { console.log(`flying at speed: ${animal.flyingspeed}`); } else { console.log(`running at speed: ${animal.runningspeed}`); } } const eagle: bird = { type: "bird", flyingspeed: 50 }; const stallion: horse = { type: "horse", runningspeed: 30 }; …

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typescript tutorial: comprehensive guide 1. introduction to typescript what is typescript? typescript is a superset of javascript that adds static typing and other features to make large-scale applications more manageable. it compiles down to plain javascript, making it compatible with any browser or javascript runtime. why use typescript? static typing : catch errors during development rather than at runtime. enhanced tooling : better autocompletion, refactoring, and error detection in ides like vs code. scalability : ideal for large projects with complex codebases. compatibility : fully interoperable with existing javascript code. setting up typescript install node.js (if not already installed). install typescript globally: npm install -g typescript verify installation: tsc --version cre...

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