map, filter & reduce

//ES6

let list = ['Bob', 'Tom', 'Geoffrey', 'Scotty'];

//Filter for names less than 7 chars long, make uppercase and put into object {id, name, length}

var nameArray = list.filter( x => x.length < 7 ) // [ 'Bob', 'Tom', 'Scotty' ]

.map( z => z.toUpperCase()) // [ 'BOB', 'TOM', 'SCOTTY' ]

.reduce( (current, next, i) => { // next is the next item in [ 'BOB', 'TOM', 'SCOTTY' ] staring at the beginning

current.push({

id: i,

name: next,

length: next.length

});

return current; // current will return when we have gone through each item in [ 'BOB', 'TOM', 'SCOTTY' ]

}, []); //[] is the 'current' starting item

console.log(nameArray);