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Keyword 'const' does not make the value immutable. What does it mean?
(5 answers)
Modifying a copy of a JavaScript object is causing the original object to change
(13 answers)
Closed 25 days ago.
I have an array declared with const, but when I console.log it 2 different times, it outputs different things.
Code where the variable is being logged, and declared
I looked at my code, and nothing should be modifying charSet, but it outputs different things.
The only thing that I can think of is that charSet is being changed because it is set = to charSet2
Related
This question already has answers here:
Understanding Javascript immutable variable
(6 answers)
Successfully changed the Immutable or Primitive Data-Types in JS. Then How these are Primitives or is JS Concepts wrong?
(3 answers)
How is mutability different from assigning a new value to a variable?
(2 answers)
Closed 1 year ago.
I am new to javascript and I am a little confused with the concept of immutability. Are javascript primitive variables immutable because they are accessed/ passed by value ? If this isn’t the reason, please mention.
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:
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,
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window.location versus just location
(9 answers)
Closed 5 years ago.
I often see window.location.hash and location.hash (hash here being a sample) referenced in various Javascripts. What is the difference between those calls (that seem to me have identical results).
window is the global object in the browser, so unqualified, undeclared names are looked up on it by default. As such, window.location and location mean the exact same thing unless a scoped variable named location has been declared.
This question already has answers here:
Closed 10 years ago.
Possible Duplicate:
javascript test for existence of nested object key
In JavaScript, is there an easier way to check if a property of a property exists?
I've been searching for an elegant way to verify if the entire object path is defined.
For example: person.positions.values[0].company.name
On every step of the way, after the person, it can be undefined.
Can this be done without actually going through them one by one?
Thank you.