favourite anomalies.js

// short-hand functions
const pythag = (a, b) => Math.sqrt(a * a + b * b);
console.log(pythag(3, 4));

// es6 classes
class Dog {
  constructor(anyType = 'nothing', cute = false) {
    this.talkThis = anyType;
    this.cute = cute;
    this.speak = this.speak.bind(this);
  }
  speak(format = true) {
    const speakString = thing => `woof! I like ${thing}`;
    if (format) {
      // new line? no worries
      console.log(speakString(
        isNaN(parseInt(this.talkThis, 10)) ?
          this.talkThis :
          'numbers')
      );
    } else {
      console.log(speakString(this.talkThis));      
    }
    // when your framework doesnt allow if statements
    !format && console.info('Format was false so we didn\'t format the text');
  }
}

let dogs = [
  'food',
  42,
  null,
  'cats'
];

new Dog().speak();
dogs.map(value => new Dog(value)).forEach(dog => dog.speak());