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Angular Core Abstractions The Iterable Differs eliraneliassy

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e-square.io — Founder & CEO @ e-square.io — Angular Google Developer Expert — Writer @ AngularInDepth — Community leader About mySelf

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Angular EXPERTS on demand https://e-square.io info@e-square.io Want to join us? jobs@e-square.io

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e-square.io New Angular Conference… Coming soon…

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e-square.io Let’s Start!

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e-square.io Angular CD • Asynchronous events • Input/Ouput • User DOM interactions Angular will check if any of the bindings has changed Teardown -> repaint the component

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Angular CD

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Event! Angular CD

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Event! Angular CD

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CD CD CD CD CD CD CD Angular CD

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onPush Event! Angular CD

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CD onPush CD CD CD Angular CD

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e-square.io onPush is enough? • NO. • Repainting is expensive(!!) • onPush is an important optimization - but, itself is probably not enough to even for small applications • Why? ngFor, ngStyle, ngClass - highly in use by Angular developers

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e-square.io Introducing IterableDiffers • Angular core abstraction • provider that allow us to compare two collections and produce a list of changes in the form of “IterableChanges” collection • Changes? Added Items, removed Items, changed position Items etc.

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e-square.io IterableDiffers

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e-square.io IterableDiffers Find

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e-square.io IterableDiffers Create

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e-square.io IterableDiffers Extend

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e-square.io IterableDiffer Types • Default Iterable Differ • Default Key Value Differ • Key Value Differ

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e-square.io Live coding…

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e-square.io Track changes in array

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e-square.io Track changes in array

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e-square.io Track changes in array

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e-square.io Track changes in array

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e-square.io Track changes in Objects

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e-square.io Track changes in Objects

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e-square.io Track changes in Objects

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e-square.io Track changes in Objects

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e-square.io Track changes in Objects

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e-square.io Add trackby function

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e-square.io Add trackby function

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e-square.io Add trackby function

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e-square.io DIY - ngStyle

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e-square.io DIY - ngStyle

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e-square.io DIY - ngStyle

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e-square.io DIY - ngStyle

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e-square.io DIY - ngStyle

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e-square.io Practical Example - Filters

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e-square.io Improving ngFor Super Fast Differs! • ngFor - Arrays, Objects • IterableDiffer can find whether given collection has changed by checking the whole collection ≈ O(n) • But, what if we’ll move the “what has been changed” logic to the collection itself? ≈ O(1) • Inspired by Minko Gechev blog: https://mgv.io/ng-diff

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e-square.io ngFor

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e-square.io The DifferableList

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e-square.io The DifferableList

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e-square.io The DifferableList Iterator

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e-square.io The DifferableList Differ

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e-square.io The DifferableList Factory

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e-square.io Extend the IterableDiffers

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e-square.io what we have learned • What are IterableDiffers and how Angular use them to accelerate our applications performance • How we can create our custom IterableDiffer and extend the IterableDiffers by using CS technics

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e-square.io Special Thanks

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Keep in Touch with me! https://e-square.io https://eliassy.dev @eliraneliassy eliran@e-square.io

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Thank You