dpashkevich

npm install --save-dev @types/jasmine

dpashkevich

declare function camelize(s: string): string;

dpashkevich

let user = { firstName: "James", lastName: "Hetfield" };
console.log(greeter(user));

dpashkevich

interface Person {
    firstName: string;
    lastName: string;
}

function greeter(person: Person): string {
    return "Hello, " + person.firstName + " " + person.lastName;
}

// Jasmine spec:

dpashkevich

function greeter(person) {
    if (!person || !person.firstName || !person.lastName) {
        throw new Error('invalid arguments');
    }

    return "Hello, " + person.firstName + " " + person.lastName;
}

// Jasmine spec:
describe("greeter", function() {

dpashkevich

function greeter(person) {
    return "Hello, " + person.firstName + " " + person.lastName;
}

dpashkevich

class Greeter {
    greeting: string;

    constructor(message: string) {
        this.greeting = message;
    }

    greet() {
        return "Hello, " + this.greeting;
    }

dpashkevich

class Greeter {
    constructor(message) {
        this.greeting = message;
    }

    greet() {
        return "Hello, " + this.greeting;
    }
}

dpashkevich

declare function camelize(s: string): string;

dpashkevich

- Trailing commas are ok
- No reserved words for property names
- NaN, Infinity, undefined : are all constants
- parseInt() defaults to radix 10
- /regexp/ produces new reg ex object every time
- JSON.parse(), JSON.stringify()
- Function.prototype.bind
- String.prototype.trim
- Array.prototype.every, filter, forEach, indexOf, lastIndexOf, map, reduce, reduceRight, some, 
- Date.now()