What is Typings in Angular 2?
“Typings is the simple way to manage and install
TypeScript definitions.”
OR
“The typings are managed by a type definition
package manager called typings”.
1.
Typings allows the TypeScript
compiler to use existing classes, properties, and so on…
2.
We can also install typings from a
repository using the typings command.
3.
In the third-party libraries, does
not ship with their own type definitions. The typings package manager is used
to install those type definitions into project.
To define a typings file as,
export declare class User {
UserName: String;
constructor(UserName?: String);
}
Two Types of typing,
1.
Static typing
2.
Dynamic typing
Angular
2 Dynamic vs. Static Typing :-
Angular 2 applications can be written both in
Typescript and in plain old JavaScript. This means we have an important choice
to make: whether to go with static typing or choose the dynamically typed path.
What’s
the difference between statically and dynamically typed languages?
Static Typing:-
Static typing requires that all variables and function
return values be typed and TypeScript is an examples of statically typed
languages.
For example as,
public sumOfTwoNumbers(num1: number, num2: number): number{
return num1 + num2;
}
This “sumOfTwoNumbers()”
function takes two numeric (or int) values as arguments and returns a number.
Dynamically Typing :-
Dynamically typing does not require explicit type
declaration. Python and JavaScript are best examples of dynamically typed languages.
The above example looks like as,
public sumOfTwoNumbers(num1, num2){
return num1 + num2;
}
After calling this method “sumOfTwoNumbers(12,
"34");” The output is 1234. There is "No error", "No warning" and nothing
else.
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Anil Singh is an author, tech blogger, and software programmer. Book writing, tech blogging is something do extra and Anil love doing it. For more detail, kindly refer to this link..
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