Lololodash

lololodash.md

Lololodash

Lo-Dash is a JavaScript library that gives us helpers for working with array, objects and JSON.

Personal question: When should we use Lo-Dash as opposed to ES5 / ES6 methods?

Getting Started

• To use Lo-Dash, we need to require it into our file: var _ = require('lodash');
• _.filter takes a collection as its first argument and properties as is second. The properties is what we use to filter through the collection

_.filter(collection, { active: true });

Sort Me

• sortBy takes a collection and a callback function or the .pluck callback shorthand.

Using a callback:

_.sortBy(collection, callback(value, index|key, collection);

Using pluck callback shorthand

_.sortBy(collection, 'age');

In Every Case

• A lot of the ES5 functions are for either Arrays or Objects but can't be used for both. Lo-Dash functions can be!

Everyone Is Min

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Chain Mail

• _.chain() lets you chain or link several Lo-Dash methods together on a collection explicitly and then finally returns the value of the whole operation.
• Example of chaining:

_.chain(words)
  .sortBy()
  .map(function(word) {
    return (word + 'chained').toUpperCase();
  })
  .value();

Count the Comments

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Give Me an Overview

• _.reduce() is just slightly different in its syntax:

_.reduce(collection, [callback=identity], [accumulator]);

• The callback is also slightly different

callback(accumulator, value, index|key, collection)

Analyze

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Start templating

• Templating allows us to interpolate data into a string similar to the way we do with ERB
• _.template('<b><%= value %></b>')({ value: 'attention' });