Answers for "map loadash"

lodash map

const _quote_filter = _.map(quote_state, (val, key) => {   if (val) {      return key   }})console.log(_quote_filter) //=> [ 'btc', undefined, undefined ]

map loadash

function square(n) {
  return n * n;
}
 
_.map([4, 8], square);
// => [16, 64]
 
_.map({ 'a': 4, 'b': 8 }, square);
// => [16, 64] (iteration order is not guaranteed)
 
var users = [
  { 'user': 'barney' },
  { 'user': 'fred' }
];
 
// The `_.property` iteratee shorthand.
_.map(users, 'user');
// => ['barney', 'fred']

lodash map

const _markets_arr = []

_.map(markets, (val, key) => {
   val.symbol = key
   if (val.buys > 0) {
      _markets_arr.push(val)
   }
})

console.log(_markets_arr)
//=> [ 
       { buys: 3, sells: 1, symbol: 'DASH/BTC' },
       { buys: 3, sells: 2, symbol: 'ETH/BTC' } 
   ]