This question already has answers here:
How does basic object/function chaining work in javascript?
(5 answers)
Understanding Methods Chaining in Javascript
(3 answers)
Closed 4 years ago.
So recently, i often to come across instagram post that invokes javascript i.e. like this --> foo.bar().baz().qux();. The insertion of parameters can be done on so many levels. However from what i have just learned, in nested object literal, we can only do foo.bar.baz.qux(); or only one parameter insertion. Can anyone show how to create nested object literals that can be invoked like this --> foo.bar().baz().qux(); ?
^cheers,
Related
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Get all instances of class in Javascript
(6 answers)
Can I get all instances for a prototype in javascript?
(2 answers)
Closed 1 year ago.
This is not a browser or DOM specific question. If a number of child objects are instantiated from a JavaScript class, is there an easy way to iterate through those objects? I know there might be some way to do this through the Object prototype chain, but I am not sure how to do this or how to do it efficiently. Would this be different in Node versus a browser window?
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What's going on in this piece of Javascript?
(1 answer)
What is instance.constructor.constructor and how does it work?
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How is this function created? A = (0)['constructor']['constructor']
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Obfuscated Javascript in an exploit kit using Array's constructor
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Clever JavaScript to bypass eval method [duplicate]
(1 answer)
Closed 1 year ago.
I am involved in Application security and often times I've used
{{constructor.constructor('alert(1)')()}}
blindly in AngularJS applications to escape the sandbox in older versions. Recently I've been trying to understand what this really means and how it works. I tried reading about object constructors and understand that an object constructor points to the object type. so for example.
var a = new String;
console.log(a.constructor);
will print out String and if I do a.constructor.constructor this will print out {}
Now my question is how does object.constructor.constructor('ANY FUNCTION HERE')() lead to that function being executed in javascript
This question already has answers here:
How is almost everything in Javascript an object?
(6 answers)
Why does a primitive variable act like an Object? [duplicate]
(3 answers)
javascript: do primitive strings have methods?
(2 answers)
Closed 2 years ago.
I have this question in mind since I started learning JavaScript last month.
What I have tried?: I researched for it online almost on all good sites but didn't get satisfactory answer in laymans language.
Question: When I create variable let suppose
let name = "mit"
name.toUpperCase()
I am using dot notation to access the method here and I know we use it for something in object. I was confused if the browser creates different object for name variable (which is of string data type here) or what?
This question already has answers here:
What is the motivation for bringing Symbols to ES6?
(7 answers)
Why do you access Symbol.iterator via brackets?
(3 answers)
Closed 3 years ago.
I recently learned that to get an iterator from an Array, you have to access it using syntax that I have never seen before: let iterator = myArray[Symbol.iterator]()
It seems to me that implementing Array.prototype.getIterator() would have been a more idiomatic way to go, but I must be oversimplifying or just not understanding the significance of accessing this property of arrays in this particular way.
In attempting to deepen my understanding of the inner workings of JavaScript I was hoping someone could explain this diversion from a more traditional syntax.
This question already has answers here:
How can I check if an object is an array? [duplicate]
(51 answers)
Closed 6 years ago.
If so, how can I detect the difference between them.
I've noticed that you can't do typeof Array hence I'm looking for different solution to see the difference.
You can detect if a variable is an array by using Array.isArray(yourArray).