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Forked from vmlf01/index.ts
Created January 28, 2024 23:08
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TypeScript training - module 2 sample
// sample shopping cart data
const shopping_cart = {
items: [
{ id: '1', name: 'T-Shirt Game of Thrones', size: 'XL', taxCode: 'IVA23', quantity: 1, unitPrice: 24.99 },
{ id: '2', name: 'T-Shirt Big Bang Theory', size: 'L', taxCode: 'IVA23', quantity: 2, unitPrice: 12.50 },
],
subTotal: 0,
tax: 0,
total: 0,
};
function getTaxRate(tax_code) {
switch (tax_code) {
case 'IVA13':
return 0.13;
case 'IVA6':
return 0.06;
default:
return 0.23;
}
}
function calculateItemTotal(item) {
return item.quantity * item.unitPrice;
}
function calculateTax(items) {
if (Array.isArray(items)) {
return items.reduce((tax, item) => tax + calculateTax(item), 0);
}
const itemTotal = calculateItemTotal(items);
return itemTotal - itemTotal / (1 + getTaxRate(items.taxCode));
}
function calculateTotal(items) {
return items.reduce((total, item) => total + calculateItemTotal(item), 0);
}
function calculateCartTotals(cart) {
let tax = calculateTax(cart.items);
let total = calculateTotal(cart.items);
return {
...cart,
subTotal: total - tax,
tax,
total,
};
}
function repeatStringNumTimes(string, times) {
let repeatedString = '';
while(times > 0) {
repeatedString += string;
times--;
}
return repeatedString;
}
function pad (value , maxLength , fillString = ' ') {
if (value.length >= maxLength) {
return value;
}
const fillLen = maxLength - value.length;
const timesToRepeat = Math.ceil(fillLen / fillString.length);
const truncatedStringFiller = repeatStringNumTimes(fillString, timesToRepeat)
.slice(0, fillLen);
return value + truncatedStringFiller;
}
function printItemLine(item) {
console.log(`${pad(item.name, 40)} | ${pad(item.quantity, 10)} | ${pad(item.unitPrice, 10)} | ${pad(calculateItemTotal(item), 10)}`);
}
function printShoppingCart(cart) {
cart = calculateCartTotals(cart);
console.log('');
console.log('SHOPPING CART');
console.log('');
console.log(repeatStringNumTimes('-', 80));
console.log(`${pad('ITEM', 40)} | ${pad('QTY', 10)} | ${pad('PRICE', 10)} | ${pad('TOTAL', 10)}`);
console.log(repeatStringNumTimes('-', 80));
cart.items.forEach(item => printItemLine(item));
console.log(repeatStringNumTimes('-', 80));
console.log(`${pad('', 56)}${pad('SUB-TOTAL', 13)}${pad(cart.subTotal, 10)}`);
console.log(`${pad('', 56)}${pad('TAX', 13)}${pad(cart.tax, 10)}`);
console.log(`${pad('', 56)}${pad('TOTAL', 13)}${pad(cart.total, 10)}`);
console.log(repeatStringNumTimes('-', 80));
}
printShoppingCart(shopping_cart);
{
"name": "sample2",
"version": "1.0.0",
"description": "",
"main": "index.js",
"scripts": {
"build": "tsc",
"build-watch": "tsc -w",
"start": "node index.js"
},
"author": "",
"license": "MIT",
"devDependencies": {
"tslint": "^5.8.0",
"typescript": "^2.5.3"
}
}
{
"compilerOptions": {
/* Basic Options */
"target": "es5", /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017', or 'ESNEXT'. */
"module": "none", /* Specify module code generation: 'none', commonjs', 'amd', 'system', 'umd', 'es2015', or 'ESNext'. */
// "lib": [], /* Specify library files to be included in the compilation: */
// "allowJs": true, /* Allow javascript files to be compiled. */
// "checkJs": true, /* Report errors in .js files. */
// "jsx": "preserve", /* Specify JSX code generation: 'preserve', 'react-native', or 'react'. */
// "declaration": true, /* Generates corresponding '.d.ts' file. */
// "sourceMap": true, /* Generates corresponding '.map' file. */
// "outFile": "./", /* Concatenate and emit output to single file. */
// "outDir": "./", /* Redirect output structure to the directory. */
// "rootDir": "./", /* Specify the root directory of input files. Use to control the output directory structure with --outDir. */
// "removeComments": true, /* Do not emit comments to output. */
// "noEmit": true, /* Do not emit outputs. */
// "importHelpers": true, /* Import emit helpers from 'tslib'. */
// "downlevelIteration": true, /* Provide full support for iterables in 'for-of', spread, and destructuring when targeting 'ES5' or 'ES3'. */
// "isolatedModules": true, /* Transpile each file as a separate module (similar to 'ts.transpileModule'). */
/* Strict Type-Checking Options */
"strict": true /* Enable all strict type-checking options. */
// "noImplicitAny": true, /* Raise error on expressions and declarations with an implied 'any' type. */
// "strictNullChecks": true, /* Enable strict null checks. */
// "noImplicitThis": true, /* Raise error on 'this' expressions with an implied 'any' type. */
// "alwaysStrict": true, /* Parse in strict mode and emit "use strict" for each source file. */
/* Additional Checks */
// "noUnusedLocals": true, /* Report errors on unused locals. */
// "noUnusedParameters": true, /* Report errors on unused parameters. */
// "noImplicitReturns": true, /* Report error when not all code paths in function return a value. */
// "noFallthroughCasesInSwitch": true, /* Report errors for fallthrough cases in switch statement. */
/* Module Resolution Options */
// "moduleResolution": "node", /* Specify module resolution strategy: 'node' (Node.js) or 'classic' (TypeScript pre-1.6). */
// "baseUrl": "./", /* Base directory to resolve non-absolute module names. */
// "paths": {}, /* A series of entries which re-map imports to lookup locations relative to the 'baseUrl'. */
// "rootDirs": [], /* List of root folders whose combined content represents the structure of the project at runtime. */
// "typeRoots": [], /* List of folders to include type definitions from. */
// "types": [], /* Type declaration files to be included in compilation. */
// "allowSyntheticDefaultImports": true, /* Allow default imports from modules with no default export. This does not affect code emit, just typechecking. */
// "preserveSymlinks": true, /* Do not resolve the real path of symlinks. */
/* Source Map Options */
// "sourceRoot": "./", /* Specify the location where debugger should locate TypeScript files instead of source locations. */
// "mapRoot": "./", /* Specify the location where debugger should locate map files instead of generated locations. */
// "inlineSourceMap": true, /* Emit a single file with source maps instead of having a separate file. */
// "inlineSources": true, /* Emit the source alongside the sourcemaps within a single file; requires '--inlineSourceMap' or '--sourceMap' to be set. */
/* Experimental Options */
// "experimentalDecorators": true, /* Enables experimental support for ES7 decorators. */
// "emitDecoratorMetadata": true, /* Enables experimental support for emitting type metadata for decorators. */
}
}
{
"defaultSeverity": "error",
"extends": [
"tslint:recommended"
],
"jsRules": {},
"rules": {
"quotemark": [true, "single"],
"object-literal-sort-keys": false
},
"rulesDirectory": []
}
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