/* 

   what is a good example that shows when to method chain vs. 

   using flowRight (single line) and flow (multiple lines)?

*/

​

// the only difference between flow and flowRight is order of invocation.

// flow starts by invoking the function on the left, flowRight starts by

// invoking the function on the right.

// You can use either with both single lines and multiple lines. 

//

// Calling it "flowRight" loses meaning when splitting onto multiple lines

// since it's really like "flowBottom". Alex uses `flowRight` for HOC

// composition because HoCs wrap themselves above the BaseComponent, so

// it just is easier to read that way. BTW, `_.flowRight` is an alias for

// `_.compose` in lodash/fp (to make the transition from Ramda easier).

​

const people = [{ name: 'bob' }, { name: 'alice' }];

​

const flowExample = _.flow(_.map(_.get('name')), _.first);

const flowRightExample = _.flowRight(_.first, _.map(_.get('name')));

​

console.log("flow example");

console.log(flowExample(people));

​

console.log("flowRight example");

console.log(flowRightExample(people));

​

// I rarely use method chaining:

// 

// It also forces me to have the data available up front, as opposed to 

// something I can put in a lib (although you can get around that too,

// but why bother?)

// 

// Not point-free, so if you get used to this style of FP you will be lost

// in some other FP languages

const firstName = 

  _(people)

    .map(_.get('name'))

    .first();

console.log("chaining example")    

console.log(firstName);