JavaScript Currying

• NOTE: can play with working code examples in the repo: learning-functional-javascript-with-ramda/basic_knowledge/currying
• used to write cleaner and more elegant code
• normally a function is created like this:

  let add = function (a, b) {
    return a = b;
  }
  
  add(1, 2);      // 3

• extra arguments can be added without throwing errors (i.e. add(1, 2, 'ignore');) because the extra argument is just ignored
• if we leave out an argument (i.e. add(1)) we get NaN which means 'Not a Number'
• a curried function won't do anything until it gets enough arguments

Benefits

• we can split functions into small pieces that are easy to reuse