Extend Your App With

JavaScriptCoreMicha MAZAHERI

iOS > Mac > Python > React

@mittsh

API BlueprintIntegration?

How can we make

Paw hackable with

JavaScriptCore?

OpenSource

Clean Your App

FocusSmallApps

Updates

Updates

CocoaScript

WebKit

Your JS API

InterfaceContract

Testing Use itLike it?

Example

JSContext* context = [[JSContext alloc] init];JSValue* gigaValue = [context evaluateScript:@"Math.pow(2,30)"];NSLog(@"1 GiB = %ld bytes", [gigaValue toNumber].integerValue);// 1 GiB = 1073741824 bytes

JSValueJavaScript Type Objective-C Type Swift Type

string NSString String

boolean BOOL Bool

number

NSNumberdoubleint32_tuint32_t

NSNumber!DoubleInt32UInt32

Date NSDate Date

Array NSArray [AnyObject]

Object NSDictionary [NSObject : AnyObject]

Object custom type custom type

JSContext

VirtualMachine

Holds AllObjects

SingleThread

JSExport

SwiftClass

JavaScriptPrototype

SwiftInstance

JavaScriptObject

/* Extend JSExport protocol */@protocol LMJSRequest <JSExport>

JSExportAs(getMethod, -(id)method);JSExportAs(getUrl, -(id)url);

JSExportAs(setMethod, -(id)method:(NSString*)method);JSExportAs(setUrl, -(id)url:(NSString*)url);

@end

/* Implement protocol as a category */@interface LMRequest (LMJSRequest) <LMJSRequest>

@end

Not The Web

DOM WebWorkers Web Crypto

Local Storage

XHR (Ajax)setTimeout

CSSPromiseWebSocket

File API

Not The Web

Pure Vanilla JS

Multithreading

Core Data Grand Central

Dispatch

Run LoopsetTimeout()

DispatchQueue.main.asyncAfter(deadline: time)

…run code…

Extensions in Paw

ImportersCodeGenerators

DynamicValues

Code Generators• Client Code (Swift, ObjC, Python, Ruby…)• Command Line (cURL, HTTPie)• API Descriptions (API Blueprint, Swagger, RAML…)• 3rd party (Postman)

Importers• HTTP Archives (HAR)• API Descriptions (API Blueprint, Swagger, RAML…)• 3rd party (Postman)

Dynamic Values• Auth (JWT, Digest, Django…)• 3rd party auth (Amazon, Auth0…)• Randomizers (Chance.js, UUID, JSON Schema)

Who uses JavaScriptCore?

React NativeSafari Build Apps

Conclusion

• We can open source more• Always have an answer• More features than any competitor• Update extensions multiple times a week

Thank You

https://paw.cloud@mittsh