julienetie

const distance = (ax, ay) => (bx, by) => Math.hypot(ax - bx, ay - by); 
const finalDistance = distance(5,5);

/*
  console.log(finalDistance(10,10)) // 7.0710678118654755
*/

julienetie

/* Pseudo-Functional JavaScript */
const rec = height => width => ({
 get area (){return  height * width}
});

/*
 // Assume 1 value is temporarily available
 const calcArea = rec(10); 
 const square = calcArea(10); // Now the other arrives
 console.log(square.area); // 100 

julienetie

/* Pseudo-Functional JavaScript */
const rectangle = (height, width) => {};

// Modules disciplined with pure functons do not
// need to protect against parameter mutation.

julienetie

/* Higher-Order JavaScript */
const animal = name => ({
  speak: () => console.log(`${name} makes a noise.`)
});

const dog = (parent, name) => {
  return Object.assign({}, parent(name), {
    speak () { console.log(`${name} barks.`) }
  });
};

julienetie

/* Object Oriented JavaScript */
class Animal { 
  constructor(name) {
    this.name = name;
  }
  
  speak() {
    console.log(`${this.name} makes a noise.`);
  }
}

julienetie

/*
 If you don't want something mutable to remain mutable, create a new context.
*/
const createBasket = (externalMutable) => {
    const privateConstant = 123; 
    let privateMutable = 'abc'; 
      return {
        get getValues(){ // New context
          return {privateConstant, privateMutable, externalMutable};
        }, 

julienetie

/* Higher-Order JavaScript */
const point = (x, y) => {
    point.distance = (a, b) => {
       const dx = a.x - b.x;
       const dy = a.y - b.y;

       return Math.hypot(dx, dy);
    };
    Object.freeze(point);
    return {x, y}; 

julienetie

/* Object Oriented JavaScript */
class Point {
  constructor(x, y) {
    this.x = x;
    this.y = y;
  }

  static distance(a, b) {
    const dx = a.x - b.x;
    const dy = a.y - b.y;

julienetie

/* Higher-Order JavaScript */
const rectangle = (height, width) => {
   return () => {
      // "height" and "width" are available privately  
   }
}

julienetie

/* Higher-Order JavaScript */
const rectangle = (height, width) => {
    const calcArea = () => height * width; 
    return {
        get area(){
            return calcArea(); 
        }, 
        calcArea
    }
};