wongjiahau

import React, { Component } from "react";
import {
  AsyncStorage, 
  View, 
  TextInput, 
  Picker,
  Text,
  Button
} from "react-native";

wongjiahau

replace with : (String , String , String) -> String
x replace y with z =



'a List :> nil
'a List :> 'a head ; 'a 

x = 1 head ; 1 ; 2 ; 3 ; 4

wongjiahau

let xs = [1,2,3,4,5,6,7,8,9,10]
// Q1. Take only the number that is more than 5

// Q2. Multiply each number by 5

// Q3. Add all numbers together



let people = [

wongjiahau

import { Endpoint } from "../../src/lib/DiloServer";

/**
 * Common response code
 *  401 - Request body error
 *  500 - Internal server error
 */

const LIST_OF_PERMISSIONS = {
    "1100": true, // User management

wongjiahau

NULL
Circle 5
Rectangle 3 4
Circle 3
Rectangle 8 1
Square 5
NULL
Rectangle 6 0
NULL
Square 8

wongjiahau

import qualified Data.Map.Strict as Map
import Data.List

-- This implementation is based on https://medium.com/@dhruvrajvanshi/type-inference-for-beginners-part-1-3e0a5be98a4b
data Expression 
    = EInt 
        Int -- value

    | EVar 
        String -- name

wongjiahau

data Shape 
    = Circle    Float
    | Square    Float
    | Rectangle Float Float
    | Null
    deriving (Show)

main :: IO ()
main = do
    -- Read contents from shape.txt

wongjiahau

interface Shape {}
class Circle extends Shape {
  constructor(public radius: number) {}
}
class Rectangle extends Shape {
  construtor(public height: number, public width: number) {}
}
class Triangle extends Shape {
  constructor(public height: number, public base: number) {}
}

wongjiahau

const newShape2: Shape = {
  label: 'circle',
  width: 30 // You'll get a compiler error saying `width` does not exists when label is `circle`
}

wongjiahau

const getArea = (shape: Shape) => {
  if (shape.radius) {
    return Math.PI * Math.pow(shape.radius, 2)
  } 
  else if (shape.height && shape.width) {
    return shape.height * shape.width
  } 
  else if (shape.base && shape.height) {
    return 0.5 * shape.base * shape.height
  }