Web Design Agency

Story

Your design company has primarily been working with CSS transformations to build webpages. After some discussion, a decision is made to start using JavaScript to perform some of the calculations dynamically. Some of your teammates are less experienced with JavaScript, so you decide to use a function closure to create reusable transformation for {x, y} coordinate pairs.

Tasks

  • Create a function whose arguments are used as a closure in a returned function.

    • A function for a 2d translation, where the outer function specifies the amount to translate, and the returned function accepts an x, y coordinate, and returns the translated coordinates.
    • A function for a 2d scaling, where the outer function specifies the amount to scale, and the returned function accepts an x, y coordinate, and returns the translated coordinates.
    • A function that returns a function that composes two functions, effectively a function for g(f(x))

  • Create a function which memoizes a function.

Implementations