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<!doctype html>
<html lang="en" class="no-js">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width,initial-scale=1">
<meta name="author" content="An Quang Phuc Le">
<link rel="icon" href="/assets/images/logo.ico">
<meta name="generator" content="mkdocs-1.5.3, mkdocs-material-9.4.7">
<title>LET Portal Documentation</title>
<link rel="stylesheet" href="/assets/stylesheets/main.4b4a2bd9.min.css">
<link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
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<style>:root{--md-text-font:"Roboto";--md-code-font:"Roboto Mono"}</style>
<link rel="stylesheet" href="/assets/css/extra.css">
<script>__md_scope=new URL("/",location),__md_hash=e=>[...e].reduce((e,_)=>(e<<5)-e+_.charCodeAt(0),0),__md_get=(e,_=localStorage,t=__md_scope)=>JSON.parse(_.getItem(t.pathname+"."+e)),__md_set=(e,_,t=localStorage,a=__md_scope)=>{try{t.setItem(a.pathname+"."+e,JSON.stringify(_))}catch(e){}}</script>
</head>
<body dir="ltr">
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<input class="md-toggle" data-md-toggle="drawer" type="checkbox" id="__drawer" autocomplete="off">
<input class="md-toggle" data-md-toggle="search" type="checkbox" id="__search" autocomplete="off">
<label class="md-overlay" for="__drawer"></label>
<div data-md-component="skip">
</div>
<div data-md-component="announce">
</div>
<header class="md-header md-header--shadow" data-md-component="header">
<nav class="md-header__inner md-grid" aria-label="Header">
<a href="/." title="LET Portal Documentation" class="md-header__button md-logo" aria-label="LET Portal Documentation" data-md-component="logo">
<img src="/assets/images/logo.ico" alt="logo">
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</label>
<div class="md-header__title" data-md-component="header-title">
<div class="md-header__ellipsis">
<div class="md-header__topic">
<span class="md-ellipsis">
LET Portal Documentation
</span>
</div>
<div class="md-header__topic" data-md-component="header-topic">
<span class="md-ellipsis">
</span>
</div>
</div>
</div>
<label class="md-header__button md-icon" for="__search">
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M9.5 3A6.5 6.5 0 0 1 16 9.5c0 1.61-.59 3.09-1.56 4.23l.27.27h.79l5 5-1.5 1.5-5-5v-.79l-.27-.27A6.516 6.516 0 0 1 9.5 16 6.5 6.5 0 0 1 3 9.5 6.5 6.5 0 0 1 9.5 3m0 2C7 5 5 7 5 9.5S7 14 9.5 14 14 12 14 9.5 12 5 9.5 5Z"/></svg>
</label>
<div class="md-search" data-md-component="search" role="dialog">
<label class="md-search__overlay" for="__search"></label>
<div class="md-search__inner" role="search">
<form class="md-search__form" name="search">
<input type="text" class="md-search__input" name="query" aria-label="Search" placeholder="Search" autocapitalize="off" autocorrect="off" autocomplete="off" spellcheck="false" data-md-component="search-query" required>
<label class="md-search__icon md-icon" for="__search">
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M9.5 3A6.5 6.5 0 0 1 16 9.5c0 1.61-.59 3.09-1.56 4.23l.27.27h.79l5 5-1.5 1.5-5-5v-.79l-.27-.27A6.516 6.516 0 0 1 9.5 16 6.5 6.5 0 0 1 3 9.5 6.5 6.5 0 0 1 9.5 3m0 2C7 5 5 7 5 9.5S7 14 9.5 14 14 12 14 9.5 12 5 9.5 5Z"/></svg>
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</label>
<nav class="md-search__options" aria-label="Search">
<button type="reset" class="md-search__icon md-icon" title="Clear" aria-label="Clear" tabindex="-1">
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M19 6.41 17.59 5 12 10.59 6.41 5 5 6.41 10.59 12 5 17.59 6.41 19 12 13.41 17.59 19 19 17.59 13.41 12 19 6.41Z"/></svg>
</button>
</nav>
</form>
<div class="md-search__output">
<div class="md-search__scrollwrap" data-md-scrollfix>
<div class="md-search-result" data-md-component="search-result">
<div class="md-search-result__meta">
Initializing search
</div>
<ol class="md-search-result__list" role="presentation"></ol>
</div>
</div>
</div>
</div>
</div>
</nav>
</header>
<div class="md-container" data-md-component="container">
<main class="md-main" data-md-component="main">
<div class="md-main__inner md-grid">
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<div class="md-sidebar__inner">
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<a href="/." title="LET Portal Documentation" class="md-nav__button md-logo" aria-label="LET Portal Documentation" data-md-component="logo">
<img src="/assets/images/logo.ico" alt="logo">
</a>
LET Portal Documentation
</label>
<ul class="md-nav__list" data-md-scrollfix>
<li class="md-nav__item">
<a href="/." class="md-nav__link">
<span class="md-ellipsis">
Introduction
</span>
</a>
</li>
<li class="md-nav__item md-nav__item--nested">
<input class="md-nav__toggle md-toggle " type="checkbox" id="__nav_2" >
<label class="md-nav__link" for="__nav_2" id="__nav_2_label" tabindex="0">
<span class="md-ellipsis">
Overview
</span>
<span class="md-nav__icon md-icon"></span>
</label>
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<span class="md-nav__icon md-icon"></span>
Overview
</label>
<ul class="md-nav__list" data-md-scrollfix>
<li class="md-nav__item">
<a href="/overview/big-picture/" class="md-nav__link">
<span class="md-ellipsis">
Big Picture
</span>
</a>
</li>
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<a href="/overview/technologies-keypoints/" class="md-nav__link">
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Technologies
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Roadmap
</span>
<span class="md-nav__icon md-icon"></span>
</label>
<nav class="md-nav" data-md-level="1" aria-labelledby="__nav_3_label" aria-expanded="false">
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<span class="md-nav__icon md-icon"></span>
Roadmap
</label>
<ul class="md-nav__list" data-md-scrollfix>
<li class="md-nav__item">
<a href="/roadmap/0.9.0/" class="md-nav__link">
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0.9.0
</span>
</a>
</li>
<li class="md-nav__item">
<a href="/roadmap/0.8.0/" class="md-nav__link">
<span class="md-ellipsis">
0.8.0
</span>
</a>
</li>
<li class="md-nav__item">
<a href="/roadmap/0.7.0/" class="md-nav__link">
<span class="md-ellipsis">
0.7.0
</span>
</a>
</li>
<li class="md-nav__item">
<a href="/roadmap/0.6.0/" class="md-nav__link">
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0.6.0
</span>
</a>
</li>
</ul>
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Installation
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Installation
</label>
<ul class="md-nav__list" data-md-scrollfix>
<li class="md-nav__item">
<a href="/installation/prerequisites/" class="md-nav__link">
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Prerequisites
</span>
</a>
</li>
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<a href="/installation/basic/" class="md-nav__link">
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Basic
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Getting Started
</span>
<span class="md-nav__icon md-icon"></span>
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Getting Started
</label>
<ul class="md-nav__list" data-md-scrollfix>
<li class="md-nav__item">
<a href="/getting-started/let-start/" class="md-nav__link">
<span class="md-ellipsis">
Let's start
</span>
</a>
</li>
<li class="md-nav__item">
<a href="/getting-started/your-first-standard/" class="md-nav__link">
<span class="md-ellipsis">
Your first standard page
</span>
</a>
</li>
<li class="md-nav__item">
<a href="/getting-started/your-first-dynamic-list/" class="md-nav__link">
<span class="md-ellipsis">
Your first dynamic list
</span>
</a>
</li>
<li class="md-nav__item">
<a href="/getting-started/your-first-chart/" class="md-nav__link">
<span class="md-ellipsis">
Your first chart
</span>
</a>
</li>
<li class="md-nav__item">
<a href="/getting-started/your-first-app/" class="md-nav__link">
<span class="md-ellipsis">
Your first app
</span>
</a>
</li>
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<input class="md-nav__toggle md-toggle " type="checkbox" id="__nav_6" >
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<span class="md-ellipsis">
Fundamentals
</span>
<span class="md-nav__icon md-icon"></span>
</label>
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<label class="md-nav__title" for="__nav_6">
<span class="md-nav__icon md-icon"></span>
Fundamentals
</label>
<ul class="md-nav__list" data-md-scrollfix>
<li class="md-nav__item">
<a href="/fundamentals/concepts/" class="md-nav__link">
<span class="md-ellipsis">
Concepts
</span>
</a>
</li>
<li class="md-nav__item">
<a href="/fundamentals/state-management/" class="md-nav__link">
<span class="md-ellipsis">
State Management
</span>
</a>
</li>
<li class="md-nav__item">
<a href="/fundamentals/chaining-events/" class="md-nav__link">
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Chaining Events
</span>
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Deep Dive
</span>
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</label>
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Deep Dive
</label>
<ul class="md-nav__list" data-md-scrollfix>
<li class="md-nav__item">
<a href="/deep-dive/app-package/" class="md-nav__link">
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App
</span>
</a>
</li>
<li class="md-nav__item">
<a href="/deep-dive/standard/" class="md-nav__link">
<span class="md-ellipsis">
Standard
</span>
</a>
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<a href="/deep-dive/standard-array/" class="md-nav__link">
<span class="md-ellipsis">
Standard Array
</span>
</a>
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<a href="/deep-dive/dynamiclist/" class="md-nav__link">
<span class="md-ellipsis">
Dynamic List
</span>
</a>
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<li class="md-nav__item">
<a href="/deep-dive/chart/" class="md-nav__link">
<span class="md-ellipsis">
Chart
</span>
</a>
</li>
<li class="md-nav__item">
<a href="/deep-dive/page/" class="md-nav__link">
<span class="md-ellipsis">
Page
</span>
</a>
</li>
<li class="md-nav__item">
<a href="/deep-dive/expression/" class="md-nav__link">
<span class="md-ellipsis">
Expression
</span>
</a>
</li>
<li class="md-nav__item">
<a href="/deep-dive/mongodb/" class="md-nav__link">
<span class="md-ellipsis">
MongoDB
</span>
</a>
</li>
<li class="md-nav__item">
<a href="/deep-dive/sql/" class="md-nav__link">
<span class="md-ellipsis">
SQL
</span>
</a>
</li>
<li class="md-nav__item">
<a href="/deep-dive/built-in-methods/" class="md-nav__link">
<span class="md-ellipsis">
Built-in methods
</span>
</a>
</li>
<li class="md-nav__item">
<a href="/deep-dive/multiple-execution-steps/" class="md-nav__link">
<span class="md-ellipsis">
Multiple Executions
</span>
</a>
</li>
<li class="md-nav__item">
<a href="/deep-dive/localization/" class="md-nav__link">
<span class="md-ellipsis">
Localization