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Unleashing the power of patterns with angular
DMITRIY SHEKHOVTSOV
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@valorkin
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ngx-bootstrap
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Your most used tool?
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!
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Patterns
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- singleton - factory - pub/sub - adapter
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- DI - module - IoC - CQRS
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Dependency injection<pattern>
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DEPENDENCY INJECTION
▸dependency injection is a technique whereby one object supplies the dependencies of another object.
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DI for 5-years oldJohn Munsch, 28 October 2009
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DI for 5-years old
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DI for 5-years old
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DI for 5-years old
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Do we really need DI?
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“ Dependency injection in Angular isn’t worth it
“
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WITHOUT DEPENDENCY INJECTION
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DI “common sense”
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Module<pattern>
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common.js
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ES6
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A bit of history
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IIFE
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- name space - encapsulation - structure code - manage dependencies
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Module Concept
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- accomplish a particular function
- or contain everything necessary
to accomplish a particular task
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@NgModule
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NgModule is Angular DI configuration point
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declarations
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exports
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imports
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providers
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Typical Problems
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Shared modules & Using component from child
module
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Lazy loaded modules & using components from
parent module
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Services with the same name
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Testing module configuration
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CHANGE DETECTION
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JS memory notes
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Data StackPrimitive Values
Memory Heap
Object
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let a = {prop:1}
Data StackPrimitive Values
Memory Heap
Object
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a.prop = 2Data StackPrimitive Values
Memory Heap
Object
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Memory Heap
Old Object
Object
let a = {prop:2}
Data StackPrimitive Values
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DIRTY CHECKING<Angular js>
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Scope
Data StackPrimitive Values
Memory Heap
Object
Object
clone
Data StackPrimitive Values
Memory Heap
Object
Object
previous scope state
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previous state
Data StackPrimitive Values
Memory Heap
Object
Object
Deep diff
Data StackPrimitive Values
Memory Heap
Object
Object
Current state
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Scope
Data StackPrimitive Values
Memory Heap
Object
Object
clone
Data StackPrimitive Values
Memory Heap
Old Object
Object
previous scope state
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STRICT EQUALITY
<angular>
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previous state
Data StackPrimitive Values
Memory Heap
Object
Object
Strict quality diff
Data StackPrimitive Values
Memory Heap
Object
Object
Current state
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IMMUTABILITY<principle>
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Patterns are everywhere
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Single Responsibility<pattern>
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Chain Of Responsibility
<pattern>
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Pure functions<pattern>
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Strategy<pattern>
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Summary
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DO NOT OVERUSE
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PROS AND CONS
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THANKS!@valorkin