Introduction to Loadash Js and its `identity` property (part 1)

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Introduction to Loadash Js and its `identity` property (part 1)

2019年11月22日
技術情報

What is Lodash

Lodash is a JavaScript library which provides utility functions for common programming tasks, delivering consistency, modularity and performance etc and it provides simple to use methods that solve common problems.

Why Lodash

Provides consistent cross browser support.
Able to use both for frontend & backend.
Lodash can follow DRY principle.
Performance and optimization for speed is better rather than native and more readable.
Declarative type.
Have good amount of contributors and active in their respositories.
Support every browser basically.

How

Can use locally or globally
Can also go through with npm
For backend use, have to require lodash in code.

I will introduce with a property called identity using in lodash js

Identity

var res = _.identity('hlaing', 'tin');
// res is hlaing

Method returns the first argument

_.identity in documentation of _.findKey and _.findLastKey

var data = {
    topic: "lodash",
    desc: "js library",
    awesome: "chaining"
};

var keyRes = _.findKey(p);        // returns "topic"
var lastKeyRes = _.findLastKey(p);    // returns "awesome"

// same with above 
var keyRes = _.findKey(p, _.identity);
var lastKeyRes = _.findLastKey(p, _.identity);

// which again means the same scenario:
var keyRes = _.findKey(p, function(x) { return x; }
var lastKeyRes = _.findLastKey(p, function(x) { return x; }

I introduced the identity property this week and will introduce the rest functionalities in coming weeks.

By Yuuma