Upgrading to

lodash 4

Individual imports

// Ember Data 2.3+

import Model                from 'ember-data/model';
import attr                 from 'ember-data/attr';
import {belongsTo, hasMany} from 'ember-data/relationships';

// Ember (imports the whole thing)

import Ember from 'ember';

const {
  computed,
  computed: {
    alias
  }
} = Ember;

Individual imports

// lodash 3

import _groupBy from 'npm:lodash/collection/groupBy';

// lodash 4: no namespace

import _groupBy from 'npm:lodash/groupBy';

// lodash 4 server-side
// (but distro size doesn't matter)

const _groupBy = require('lodash/groupBy');

// lodash 4: can import a namespace (but don't)

import _collection from 'npm:lodash/collection';

Huge downside: no chaining

// Chaining


import _ from 'npm:lodash';



const result =
  _(sourceData)
    .groupBy('someField')
    .map(someCallback)
    .uniq()
    .value();

// Using individual methods reverses order
// and ruins readability

import _groupBy from 'npm:lodash/groupBy';
import _map     from 'npm:lodash/map';
import _uniq    from 'npm:lodash/uniq';

const result =
  _uniq(
    _map(
      _groupBy(sourceData, 'someField'),
      someCallback
    )
  );

FP-style lodash funcitons

// Normal function

import _map from 'npm:lodash/map';

let result = _map(sourceData, callback);

// FP-style function

import _mapFP from 'npm:lodash/fp/map';

result = _mapFP(callback, sourceData); // Reverse order, no optional args

result = _mapFP(callback)(sourceData); // Currying!

No chaining solution: flow()

// Chaining


import _ from 'npm:lodash';




const result =
  _(sourceData)
    .groupBy('someField')
    .map(someCallback)
    .uniq()
    .value();

// Chaining relpacement via flow()


import _groupByFP from 'npm:lodash/fp/groupBy';
import _mapFP     from 'npm:lodash/fp/map';
import _uniq      from 'npm:lodash/uniq';
import _flow      from 'npm:lodash/flow';

let result =
  _flow(
    _groupByFP('someField'),
    _mapFP(someCallback),
    _uniq
  )(data);

import chainy from 'exam-sim-ember/utils/chainy';

let result =
  chainy(sourceData)(
    _groupByFP('someField'),
    _map(someCallback),
    _uniq);

Upgrading tolodash 4

By Andrey Mikhaylov (lolmaus)

Upgrading to

lodash 4

Upgrading tolodash 4

More from Andrey Mikhaylov (lolmaus)