Linked Questions
21 questions linked to/from How is a JavaScript string not an object?
14
votes
6
answers
11k
views
Are strings objects? [duplicate]
Here are two reasons to think strings are objects. First, you can create a string in the following way:
var mystring = new String("asdf");
I'm under the impression that the constructor function ...
- 2,817
4
votes
1
answer
386
views
If a string is not an object, how am I able to use built-in methods? [duplicate]
When you create an object in JavaScript, you inherit properties from the Object prototype you can utilize.
But a string is a primitive type, thus there is no prototype. So how am I able to use ...
- 897
1
vote
0
answers
233
views
Primitive data vs Complex data in Javascript [duplicate]
I have studied about primitive data and complex data in w3schools. I searched elsewhere as well, but they don't give sense for me.The sentence stated below defines a primitive data.
A primitive data ...
user9167442
0
votes
0
answers
134
views
How is it possible for a String literal to use methods and properties of String Object in JavaScript? [duplicate]
var str1 = "Sagar"; //String literal
var str2 = new String("Sagar"); //String Object
str1.length; // Output: 5
str2.length; // Output: 5
/* How is it possible for a string literal ...
3
votes
0
answers
52
views
Why can't I define an iterator on a string? [duplicate]
Here's a contrived example.
I can do this with an instance an array:
function* cut () {
for (let slice = 0; slice < 3; slice++) yield '🍰';
}
const cake = ['🎂'];
cake[Symbol.iterator] = cut;
...
- 19.3k
1
vote
0
answers
31
views
How can primitive values have properties in JavaScript? [duplicate]
I have a little misunderstanding in JavaScript string type.
According to JavaScript: The Definitive Guide, by David Flanagan,
Any JavaScript value that is not a number, a string, a boolean, or
...
- 3,902
368
votes
29
answers
83k
views
What should every JavaScript programmer know? [closed]
Is there a set of things that every JavaScript programmer should know to be able to say "I know JavaScript"?
105
votes
7
answers
260k
views
How to get an object's properties in JavaScript / jQuery?
In JavaScript / jQuery, if I alert some object, I get either [object] or [object Object]
Is there any way to know:
what is the difference between these two objects
what type of Object is this
what ...
- 1,612
65
votes
2
answers
17k
views
Difference between the javascript String Type and String Object?
I've been messing around with the ECMA-262 standard (ECMAScript Language Specification, 3rd edition, if it matters for this - I have not found any difference between the 3rd and 5th edition on String ...
- 19.6k
35
votes
2
answers
7k
views
Why can some constructors be called without using the `new` operator?
Please help me to understand why the following code works:
var re = RegExp('\\ba\\b') ;
console.log(re.test('a')) ;
console.log(re.test('ab')) ;
In the first line there is no new operator.
...
- 43k
38
votes
3
answers
1k
views
Why are there two kinds of JavaScript strings?
This one just stabbed me hard. I don't know if it's the case with all browsers (I don't have any other competent browser to test with), but at least Firefox has two kind of string objects.
Open up ...
- 139k
15
votes
4
answers
5k
views
Does Javascript's new operator do anything but make life difficult?
I come from the traditional web developer background where I can by no means claim to really know anything about Javascript, however I am trying.
I currently have what I would describe as a fairly ...
- 123k
4
votes
2
answers
932
views
Difference between Object.create(foo) and new Object(foo)?
Why is that this code:
var foo = {one: 1, two: 2};
var bar = new Object( foo );
bar.three = 3;
bar.one = 100;
document.write(bar.one); //100
document.write(foo.one); //100
results in bar.one & ...
- 4,883
5
votes
2
answers
1k
views
String object versus literal - modifying the prototype?
I'm wondering why it seems that adding a method to the prototype of a string literal seems to work, but adding a property does not? I was playing with ideas in relation to this question, and have the ...
- 41.9k
5
votes
6
answers
266
views
JavaScript - behaviour of Function core object
As far as I understand, in JavaScript (Gecko variant) this:
var a = new A();
is a syntactic sugar for something like this:
var a = {};
a.__proto__ = A.prototype;
A.call(a);
Because of that, A() (...
- 16.4k