Chumarat Pat

Chumarat Pat

1600660334

Adding special values to types in TypeScript

One way of understanding types is as sets of values. Sometimes there are two levels of values:

  • Base level: normal values
  • Meta level: special values

In this blog post, we examine how we can add special values to base-level types.


Table of contents:

  • Adding special values in band
  • Adding null or undefined to a type
  • Adding a symbol to a type
  • Adding special values out of band
  • Discriminated unions
  • Other kinds of type unions

#typescript

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Adding special values to types in TypeScript
Chumarat Pat

Chumarat Pat

1600660334

Adding special values to types in TypeScript

One way of understanding types is as sets of values. Sometimes there are two levels of values:

  • Base level: normal values
  • Meta level: special values

In this blog post, we examine how we can add special values to base-level types.


Table of contents:

  • Adding special values in band
  • Adding null or undefined to a type
  • Adding a symbol to a type
  • Adding special values out of band
  • Discriminated unions
  • Other kinds of type unions

#typescript

Sagar Shende

Sagar Shende

1586925040

Flutter - How to Add AdMob Real Ads in Flutter App | Flutter AdMob Tutorial

Hello Whats is up Everyone So, Today I am going to show u How to Add Admob Real ads in Flutter apps which are very Easy Implement After watching this video u r going to understand Each & everything

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Part 1 Video
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Check out our Website for more Flutter Tutorials
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Flutter - How to Add AdMob Real Ads in Flutter App | Flutter AdMob Tutorial

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#flutter ads #ads in flutter #flutter admob ads #how to add ads in flutter app #real ads in flutter

Arvel  Parker

Arvel Parker

1593156510

Basic Data Types in Python | Python Web Development For Beginners

At the end of 2019, Python is one of the fastest-growing programming languages. More than 10% of developers have opted for Python development.

In the programming world, Data types play an important role. Each Variable is stored in different data types and responsible for various functions. Python had two different objects, and They are mutable and immutable objects.

Table of Contents  hide

I Mutable objects

II Immutable objects

III Built-in data types in Python

Mutable objects

The Size and declared value and its sequence of the object can able to be modified called mutable objects.

Mutable Data Types are list, dict, set, byte array

Immutable objects

The Size and declared value and its sequence of the object can able to be modified.

Immutable data types are int, float, complex, String, tuples, bytes, and frozen sets.

id() and type() is used to know the Identity and data type of the object

a**=25+**85j

type**(a)**

output**:<class’complex’>**

b**={1:10,2:“Pinky”****}**

id**(b)**

output**:**238989244168

Built-in data types in Python

a**=str(“Hello python world”)****#str**

b**=int(18)****#int**

c**=float(20482.5)****#float**

d**=complex(5+85j)****#complex**

e**=list((“python”,“fast”,“growing”,“in”,2018))****#list**

f**=tuple((“python”,“easy”,“learning”))****#tuple**

g**=range(10)****#range**

h**=dict(name=“Vidu”,age=36)****#dict**

i**=set((“python”,“fast”,“growing”,“in”,2018))****#set**

j**=frozenset((“python”,“fast”,“growing”,“in”,2018))****#frozenset**

k**=bool(18)****#bool**

l**=bytes(8)****#bytes**

m**=bytearray(8)****#bytearray**

n**=memoryview(bytes(18))****#memoryview**

Numbers (int,Float,Complex)

Numbers are stored in numeric Types. when a number is assigned to a variable, Python creates Number objects.

#signed interger

age**=**18

print**(age)**

Output**:**18

Python supports 3 types of numeric data.

int (signed integers like 20, 2, 225, etc.)

float (float is used to store floating-point numbers like 9.8, 3.1444, 89.52, etc.)

complex (complex numbers like 8.94j, 4.0 + 7.3j, etc.)

A complex number contains an ordered pair, i.e., a + ib where a and b denote the real and imaginary parts respectively).

String

The string can be represented as the sequence of characters in the quotation marks. In python, to define strings we can use single, double, or triple quotes.

# String Handling

‘Hello Python’

#single (') Quoted String

“Hello Python”

# Double (") Quoted String

“”“Hello Python”“”

‘’‘Hello Python’‘’

# triple (‘’') (“”") Quoted String

In python, string handling is a straightforward task, and python provides various built-in functions and operators for representing strings.

The operator “+” is used to concatenate strings and “*” is used to repeat the string.

“Hello”+“python”

output**:****‘Hello python’**

"python "*****2

'Output : Python python ’

#python web development #data types in python #list of all python data types #python data types #python datatypes #python types #python variable type

Christa  Stehr

Christa Stehr

1599315360

Nominal typing in Typescript

Nominal & structural typing

Type systems are typically categorized as either structural or nominal. Languages like Java and Scala have primarily nominal type systems, whereas a language like Typescript has a structural type system. Let’s take a brief look at both systems.

Nominal Typing

In a nominal typing system, type compatibility is checked using the name of the types. If they do not have the same name, then they are not compatible; end of story. **If **Typescript had a nominal typing system the type check for the last line would fail:

Image for post

Structural typing

Typescript uses structural typing to decide whether two types are compatible with one another or not. What do we mean by structural typing? Well, let’s consider the following code snippet:

Image for post

To determine whether the type of the constant color(RGBA) is compatible with the type of serializeColor’s parameter x(RGB) the type system must verify that each member of RGB has a corresponding compatible member in RGBA. In this case, RGB has a single member color for which RGBA has a corresponding member with the same type — [number, number, number] — and so it passes the type check. Notice how the type system ignores the additional members that exist on RGBA (alpha).

#typescript #type-safe #type-systems

Sahil Kataria

Sahil Kataria

1598605747

Steps for Preparing Ads for your PPC Campaign using Google Adwords

Read the blog to get aware about the Steps required for Preparing Ads for your PPC Campaign using Google Adwords that will help to make you more money.

#learn google ads #steps to create google ads #google ads strategy #how to create google ads #tips for creating google ads