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I'm learning JavaScript/ReactJS and I'm finding I'm using functions with these variations:
public _someName = () => {} why the = before round brackets and why the lambda?
and
public _someName() {} What does this one NOT do compared to the above.
I've looked on SO and generally for some clear explanation of the difference but nothing has been found. Can someone tell me what the difference is based on my notes above.
Btw: I've read the docs!
Related
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I have a class and a function, as follows:
class A {}
function B {}
I need to dynamically instantiate them, in a way similar to Java's class.forName().
I am able to instantiate the function as follows:
new window["B"]
However
window["A"] === undefined
Why the difference? Aren't classes just syntactic sugar for functions?
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I am currently finding it hard to figure out the difference between an object literal and a class.
Here's a link!
This might be helpful for you.
Content of the link:
The most significant difference I can see between creating classes and
literally notated objects is that the latter are entire objects,
whereas classes are not objects, but blueprints from which objects are
created.
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How does this work:
const invert = fn => (...args) => -fn(...args);
Specifically, what is happening with (...args). It behaves as if it is separating the arguments from the function after the first fat arrow, but I suspect there is a better, more specific, explanation. Thanks.
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In what circumstance is the .this keyword unbound? In my react code, I have found that I have to use this.someMethod = this.someMethod.bind(this) in the constructor() to access the properties of that method. Is this only when my method is triggered by an event listener, or is this necessary for all methods? Also are there any other situations that will break the access to .this?
This question already has answers here:
Closed 10 years ago.
Possible Duplicate:
Javascript object creation using literals vs custom constructor functions
Function vs. Object Literal Notaion - Which is better, or is it a matter of preference?
Could anyone enlighten me what is the difference between below two ways of creating objects in JavaScript or more specifically drawbacks/advantages of them:
Function Foo() {
function bar () {...}
}
And
var Foo = {
bar : function() {}
}
Also since in latter way, there is no this keyword, how can I make it object instance member ?