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Added lesson 4
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@gitdagray
gitdagray committed Oct 31, 2022
1 parent 802866a commit 18529ad
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1 change: 1 addition & 0 deletions README.md
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- 🔗 [Chapter 1 - Introduction, Setup & Config](https://github.com/gitdagray/typescript-course/tree/main/lesson01)
- 🔗 [Chapter 2 - Basic Types](https://github.com/gitdagray/typescript-course/tree/main/lesson02)
- 🔗 [Chapter 3 - Arrays, Tuples, Objects & Enums](https://github.com/gitdagray/typescript-course/tree/main/lesson03)
- 🔗 [Chapter 4 - Type Aliases, Literals, Functions & Never Type](https://github.com/gitdagray/typescript-course/tree/main/lesson04)
21 changes: 21 additions & 0 deletions lesson04/build/index.html
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<!DOCTYPE html>
<html lang="en">

<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
body {
background-color: #000;
}
</style>
<script src="js/main.js" defer></script>
</head>

<body>

</body>

</html>
68 changes: 68 additions & 0 deletions lesson04/build/js/main.js
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"use strict";
// Literal types
let myName;
let userName;
userName = 'Amy';
// functions
const add = (a, b) => {
return a + b;
};
const logMsg = (message) => {
console.log(message);
};
logMsg('Hello!');
logMsg(add(2, 3));
let subtract = function (c, d) {
return c - d;
};
// interface mathFunction {
// (a: number, b: number): number
// }
let multiply = function (c, d) {
return c * d;
};
logMsg(multiply(2, 2));
// optional parameters
const addAll = (a, b, c) => {
if (typeof c !== 'undefined') {
return a + b + c;
}
return a + b;
};
// default param value
const sumAll = (a = 10, b, c = 2) => {
return a + b + c;
};
logMsg(addAll(2, 3, 2));
logMsg(addAll(2, 3));
logMsg(sumAll(2, 3));
logMsg(sumAll(undefined, 3));
// Rest Parameters
const total = (a, ...nums) => {
return a + nums.reduce((prev, curr) => prev + curr);
};
logMsg(total(10, 2, 3));
const createError = (errMsg) => {
throw new Error(errMsg);
};
const infinite = () => {
let i = 1;
while (true) {
i++;
if (i > 100)
break;
}
};
// custom type guard
const isNumber = (value) => {
return typeof value === 'number'
? true : false;
};
// use of the never type
const numberOrString = (value) => {
if (typeof value === 'string')
return 'string';
if (isNumber(value))
return 'number';
return createError('This should never happen!');
};
95 changes: 95 additions & 0 deletions lesson04/src/main.ts
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// Type Aliases
type stringOrNumber = string | number

type stringOrNumberArray = (string | number)[]

type Guitarist = {
name?: string,
active: boolean,
albums: stringOrNumberArray
}

type UserId = stringOrNumber

// Literal types
let myName: 'Dave'

let userName: 'Dave' | 'John' | 'Amy'
userName = 'Amy'

// functions
const add = (a: number, b: number): number => {
return a + b
}

const logMsg = (message: any): void => {
console.log(message)
}

logMsg('Hello!')
logMsg(add(2, 3))

let subtract = function (c: number, d: number): number {
return c - d
}

type mathFunction = (a: number, b: number) => number
// interface mathFunction {
// (a: number, b: number): number
// }

let multiply: mathFunction = function (c, d) {
return c * d
}

logMsg(multiply(2, 2))

// optional parameters
const addAll = (a: number, b: number, c?: number): number => {
if (typeof c !== 'undefined') {
return a + b + c
}
return a + b
}

// default param value
const sumAll = (a: number = 10, b: number, c: number = 2): number => {
return a + b + c
}

logMsg(addAll(2, 3, 2))
logMsg(addAll(2, 3))
logMsg(sumAll(2, 3))
logMsg(sumAll(undefined, 3))

// Rest Parameters
const total = (a: number, ...nums: number[]): number => {
return a + nums.reduce((prev, curr) => prev + curr)
}

logMsg(total(10, 2, 3))

const createError = (errMsg: string): never => {
throw new Error(errMsg)
}

const infinite = () => {
let i: number = 1
while (true) {
i++
if (i > 100) break
}
}

// custom type guard
const isNumber = (value: any): boolean => {
return typeof value === 'number'
? true : false
}

// use of the never type
const numberOrString = (value: number | string): string => {
if (typeof value === 'string') return 'string'
if (isNumber(value)) return 'number'
return createError('This should never happen!')
}
98 changes: 98 additions & 0 deletions lesson04/tsconfig.json
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{
"compilerOptions": {
/* Visit https://aka.ms/tsconfig to read more about this file */
/* Projects */
// "incremental": true, /* Save .tsbuildinfo files to allow for incremental compilation of projects. */
// "composite": true, /* Enable constraints that allow a TypeScript project to be used with project references. */
// "tsBuildInfoFile": "./.tsbuildinfo", /* Specify the path to .tsbuildinfo incremental compilation file. */
// "disableSourceOfProjectReferenceRedirect": true, /* Disable preferring source files instead of declaration files when referencing composite projects. */
// "disableSolutionSearching": true, /* Opt a project out of multi-project reference checking when editing. */
// "disableReferencedProjectLoad": true, /* Reduce the number of projects loaded automatically by TypeScript. */
/* Language and Environment */
"target": "es2016", /* Set the JavaScript language version for emitted JavaScript and include compatible library declarations. */
// "lib": [], /* Specify a set of bundled library declaration files that describe the target runtime environment. */
// "jsx": "preserve", /* Specify what JSX code is generated. */
// "experimentalDecorators": true, /* Enable experimental support for TC39 stage 2 draft decorators. */
// "emitDecoratorMetadata": true, /* Emit design-type metadata for decorated declarations in source files. */
// "jsxFactory": "", /* Specify the JSX factory function used when targeting React JSX emit, e.g. 'React.createElement' or 'h'. */
// "jsxFragmentFactory": "", /* Specify the JSX Fragment reference used for fragments when targeting React JSX emit e.g. 'React.Fragment' or 'Fragment'. */
// "jsxImportSource": "", /* Specify module specifier used to import the JSX factory functions when using 'jsx: react-jsx*'. */
// "reactNamespace": "", /* Specify the object invoked for 'createElement'. This only applies when targeting 'react' JSX emit. */
// "noLib": true, /* Disable including any library files, including the default lib.d.ts. */
// "useDefineForClassFields": true, /* Emit ECMAScript-standard-compliant class fields. */
// "moduleDetection": "auto", /* Control what method is used to detect module-format JS files. */
/* Modules */
"module": "commonjs", /* Specify what module code is generated. */
"rootDir": "./src", /* Specify the root folder within your source files. */
// "moduleResolution": "node", /* Specify how TypeScript looks up a file from a given module specifier. */
// "baseUrl": "./", /* Specify the base directory to resolve non-relative module names. */
// "paths": {}, /* Specify a set of entries that re-map imports to additional lookup locations. */
// "rootDirs": [], /* Allow multiple folders to be treated as one when resolving modules. */
// "typeRoots": [], /* Specify multiple folders that act like './node_modules/@types'. */
// "types": [], /* Specify type package names to be included without being referenced in a source file. */
// "allowUmdGlobalAccess": true, /* Allow accessing UMD globals from modules. */
// "moduleSuffixes": [], /* List of file name suffixes to search when resolving a module. */
// "resolveJsonModule": true, /* Enable importing .json files. */
// "noResolve": true, /* Disallow 'import's, 'require's or '<reference>'s from expanding the number of files TypeScript should add to a project. */
/* JavaScript Support */
// "allowJs": true, /* Allow JavaScript files to be a part of your program. Use the 'checkJS' option to get errors from these files. */
// "checkJs": true, /* Enable error reporting in type-checked JavaScript files. */
// "maxNodeModuleJsDepth": 1, /* Specify the maximum folder depth used for checking JavaScript files from 'node_modules'. Only applicable with 'allowJs'. */
/* Emit */
// "declaration": true, /* Generate .d.ts files from TypeScript and JavaScript files in your project. */
// "declarationMap": true, /* Create sourcemaps for d.ts files. */
// "emitDeclarationOnly": true, /* Only output d.ts files and not JavaScript files. */
// "sourceMap": true, /* Create source map files for emitted JavaScript files. */
// "outFile": "./", /* Specify a file that bundles all outputs into one JavaScript file. If 'declaration' is true, also designates a file that bundles all .d.ts output. */
"outDir": "./build/js", /* Specify an output folder for all emitted files. */
// "removeComments": true, /* Disable emitting comments. */
// "noEmit": true, /* Disable emitting files from a compilation. */
// "importHelpers": true, /* Allow importing helper functions from tslib once per project, instead of including them per-file. */
// "importsNotUsedAsValues": "remove", /* Specify emit/checking behavior for imports that are only used for types. */
// "downlevelIteration": true, /* Emit more compliant, but verbose and less performant JavaScript for iteration. */
// "sourceRoot": "", /* Specify the root path for debuggers to find the reference source code. */
// "mapRoot": "", /* Specify the location where debugger should locate map files instead of generated locations. */
// "inlineSourceMap": true, /* Include sourcemap files inside the emitted JavaScript. */
// "inlineSources": true, /* Include source code in the sourcemaps inside the emitted JavaScript. */
// "emitBOM": true, /* Emit a UTF-8 Byte Order Mark (BOM) in the beginning of output files. */
// "newLine": "crlf", /* Set the newline character for emitting files. */
// "stripInternal": true, /* Disable emitting declarations that have '@internal' in their JSDoc comments. */
// "noEmitHelpers": true, /* Disable generating custom helper functions like '__extends' in compiled output. */
// "noEmitOnError": true, /* Disable emitting files if any type checking errors are reported. */
// "preserveConstEnums": true, /* Disable erasing 'const enum' declarations in generated code. */
// "declarationDir": "./", /* Specify the output directory for generated declaration files. */
// "preserveValueImports": true, /* Preserve unused imported values in the JavaScript output that would otherwise be removed. */
/* Interop Constraints */
// "isolatedModules": true, /* Ensure that each file can be safely transpiled without relying on other imports. */
// "allowSyntheticDefaultImports": true, /* Allow 'import x from y' when a module doesn't have a default export. */
"esModuleInterop": true, /* Emit additional JavaScript to ease support for importing CommonJS modules. This enables 'allowSyntheticDefaultImports' for type compatibility. */
// "preserveSymlinks": true, /* Disable resolving symlinks to their realpath. This correlates to the same flag in node. */
"forceConsistentCasingInFileNames": true, /* Ensure that casing is correct in imports. */
/* Type Checking */
"strict": true, /* Enable all strict type-checking options. */
// "noImplicitAny": true, /* Enable error reporting for expressions and declarations with an implied 'any' type. */
// "strictNullChecks": true, /* When type checking, take into account 'null' and 'undefined'. */
// "strictFunctionTypes": true, /* When assigning functions, check to ensure parameters and the return values are subtype-compatible. */
// "strictBindCallApply": true, /* Check that the arguments for 'bind', 'call', and 'apply' methods match the original function. */
// "strictPropertyInitialization": true, /* Check for class properties that are declared but not set in the constructor. */
// "noImplicitThis": true, /* Enable error reporting when 'this' is given the type 'any'. */
// "useUnknownInCatchVariables": true, /* Default catch clause variables as 'unknown' instead of 'any'. */
// "alwaysStrict": true, /* Ensure 'use strict' is always emitted. */
// "noUnusedLocals": true, /* Enable error reporting when local variables aren't read. */
// "noUnusedParameters": true, /* Raise an error when a function parameter isn't read. */
// "exactOptionalPropertyTypes": true, /* Interpret optional property types as written, rather than adding 'undefined'. */
// "noImplicitReturns": true, /* Enable error reporting for codepaths that do not explicitly return in a function. */
// "noFallthroughCasesInSwitch": true, /* Enable error reporting for fallthrough cases in switch statements. */
// "noUncheckedIndexedAccess": true, /* Add 'undefined' to a type when accessed using an index. */
// "noImplicitOverride": true, /* Ensure overriding members in derived classes are marked with an override modifier. */
// "noPropertyAccessFromIndexSignature": true, /* Enforces using indexed accessors for keys declared using an indexed type. */
// "allowUnusedLabels": true, /* Disable error reporting for unused labels. */
// "allowUnreachableCode": true, /* Disable error reporting for unreachable code. */
/* Completeness */
// "skipDefaultLibCheck": true, /* Skip type checking .d.ts files that are included with TypeScript. */
"skipLibCheck": true /* Skip type checking all .d.ts files. */
},
"include": [
"src"
]
}

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