Create Next App

Lab 3

Variables and Constants

functionScoped = 2
blockScoped = 5
constant1 = -3

Variables Types

numberVariable = 123
floatingPointNumber = 234.345
stringVariable = Hello World!
booleanVariable = true
isNumber = number
isString = string
isBoolean = boolean

Boolean Variables

true1 = true
false1 = false
false2 = false
true2 = true
true3 = true
true4 = true
true5 = true
false3 = false

If Else

true1

!false1

Logged In

Welcome

Welcome If Else

Please login Inline

Functions

Legacy ES5 functions

twoPlusFour = 6
add(2, 4) = 6

New ES6 arrow functions

threeMinusOne = 2
subtract(3, 1) = 2

Implied return

fourTimesFive = 20
multiply(4, 5) = 20

Template Literals

result1 = 2 + 3 = 5
result2 = 2 + 3 = 5
greeting1 = Welcome home alice
greeting2 = Logged in: No

Simple Arrays

numberArray1 = 12345
stringArray1 = string1string2
variableArray1 = 25-312345string1string2
Todo list:

Buy milk
Feed the pets

Array index and length

length1 = 5
index1 = 2

Add/remove to/from arrays

numberArray1 = 12456
stringArray1 = string1string3
Todo list:

Buy milk
Feed the pets
Walk the dogs

Looping through arrays

stringArray2 = STRING1STRING3

Map Function

squares = 149162536
cubes = 182764125216
Todos:

Buy milk
Feed the pets

Find Function

four = 4
string3 = string3

Find Index Function

fourIndex = 2

String3Index = 1

Filter Function

numbersGreaterThan2 = 456
evenNumbers = 246
oddNumbers = 15

JSON Stringify

squares = [1,4,16,25,36]

House

bedrooms

bathrooms

2.5

Data

{
  "bedrooms": 4,
  "bathrooms": 2.5,
  "squareFeet": 2000,
  "address": {
    "street": "Via Roma",
    "city": "Roma",
    "state": "RM",
    "zip": "00100",
    "country": "Italy"
  },
  "owners": [
    "Alice",
    "Bob"
  ]
}

Spread Operator

Array Spread

arr1 = [1,2,3]
arr2 = [1,2,3,4,5,6]

Object Spread

{"a":1,"b":2,"c":3}
{"a":1,"b":2,"c":3,"d":4,"e":5,"f":6}
{"a":1,"b":4,"c":3}

Destructing

Object Destructing

const { name, age } = { name: “John“, age: 25 }

name = John
age = 25

Array Destructing

const [first, second, third] = [“one“,“two“,“three“]

first = one
second = two
third = three

Function Destructing

const add = (a, b) => a + b;
const sum = add(1, 2);
const subtract = ({ a, b }) => a - b;
const difference = subtract({ a: 4, b: 2 });
sum = 3
difference = 2

Destructing Imports

Math	Matematica	Functions
Math.add(2, 3) = 5	Matematica.add(2, 3) =5	add(2, 3) = 5
Math.subtract(5, 1) = 4	Matematica.subtract(5, 1) =4	subtract(5, 1) = 4
Math.multiply(3, 4) = 12	Matematica.multiply(3, 4) =12	multiply(3, 4) = 12
Math.divide(8, 2) = 4	Matematica.divide(8, 2) =4	divide(8, 2) = 4

Classes

Dangerous background

Dynamic Blue background

Yellow background

Blue background

Red background

Styles

Yellow background

Red background

Blue background

Add

a = 3
b = 5
a + b = 8

Square of 5

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Path Parameters

1 + 2
3 + 4

Buy milk (COMPLETED)

Todo List

Buy milk (CANCELED)

Pickup the kids (IN PROGRESS)

Walk the dog (DEFERRED)