When does JS create an object wrapper for a string?
up vote
3
down vote
favorite
Symbol.iterator in 'retularString' // error right-hand side of in sould be an object
Symbol.iterator in new String() // true
Does that mean JS creates object wrappers for strings only when it calls methods / or accesses corresponding properties on them like 'string'.toUppercase() / 'string'.length?
javascript javascript-objects
asked Nov 13 at 7:09
daGo
505512
add a comment |
up vote
3
down vote
favorite
Symbol.iterator in 'retularString' // error right-hand side of in sould be an object
Symbol.iterator in new String() // true
Does that mean JS creates object wrappers for strings only when it calls methods / or accesses corresponding properties on them like 'string'.toUppercase() / 'string'.length?
javascript javascript-objects
asked Nov 13 at 7:09
daGo
505512
add a comment |
up vote
3
down vote
favorite
up vote
3
down vote
favorite
Symbol.iterator in 'retularString' // error right-hand side of in sould be an object
Symbol.iterator in new String() // true
Does that mean JS creates object wrappers for strings only when it calls methods / or accesses corresponding properties on them like 'string'.toUppercase() / 'string'.length?
javascript javascript-objects
asked Nov 13 at 7:09
daGo
505512
Symbol.iterator in 'retularString' // error right-hand side of in sould be an object
Symbol.iterator in new String() // true
Does that mean JS creates object wrappers for strings only when it calls methods / or accesses corresponding properties on them like 'string'.toUppercase() / 'string'.length?
javascript javascript-objects
javascript javascript-objects
asked Nov 13 at 7:09
daGo
505512
asked Nov 13 at 7:09
daGo
505512
edited Nov 13 at 7:15
asked Nov 13 at 7:09
daGo
505512
asked Nov 13 at 7:09
daGo
505512
asked Nov 13 at 7:09
daGo
505512
505512
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
up vote
3
down vote
accepted
Does that mean JS creates object wrappers for strings only when it calls methods / or accesses corresponding properties on them like
'string'.toUppercase()/'string'.length?
Yes.
When you have a string declared as var foo = 'foo' its type is the primitive string, having no properties inherently, but when you try and access a property on it, the primitive is wrapped momentarily in the String object through a process called implicit coercion.
See this article for a full explanation of coercion in JavaScript.
answered Nov 13 at 7:22
Vulcan
22.4k93976
1
Perhaps the answers to this question are a good addition: stackoverflow.com/q/17256182/10245948
– Hero Wanders
Nov 13 at 7:47
I just wanted to be sure that's wrapping does not occur upon any other circumstances.
– daGo
Nov 13 at 8:00
add a comment |
1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
up vote
3
down vote
accepted
Does that mean JS creates object wrappers for strings only when it calls methods / or accesses corresponding properties on them like
'string'.toUppercase()/'string'.length?
Yes.
When you have a string declared as var foo = 'foo' its type is the primitive string, having no properties inherently, but when you try and access a property on it, the primitive is wrapped momentarily in the String object through a process called implicit coercion.
See this article for a full explanation of coercion in JavaScript.
answered Nov 13 at 7:22
Vulcan
22.4k93976
1
Perhaps the answers to this question are a good addition: stackoverflow.com/q/17256182/10245948
– Hero Wanders
Nov 13 at 7:47
I just wanted to be sure that's wrapping does not occur upon any other circumstances.
– daGo
Nov 13 at 8:00
add a comment |
up vote
3
down vote
accepted
Does that mean JS creates object wrappers for strings only when it calls methods / or accesses corresponding properties on them like
'string'.toUppercase()/'string'.length?
Yes.
When you have a string declared as var foo = 'foo' its type is the primitive string, having no properties inherently, but when you try and access a property on it, the primitive is wrapped momentarily in the String object through a process called implicit coercion.
See this article for a full explanation of coercion in JavaScript.
answered Nov 13 at 7:22
Vulcan
22.4k93976
1
Perhaps the answers to this question are a good addition: stackoverflow.com/q/17256182/10245948
– Hero Wanders
Nov 13 at 7:47
I just wanted to be sure that's wrapping does not occur upon any other circumstances.
– daGo
Nov 13 at 8:00
add a comment |
up vote
3
down vote
accepted
up vote
3
down vote
accepted
Does that mean JS creates object wrappers for strings only when it calls methods / or accesses corresponding properties on them like
'string'.toUppercase()/'string'.length?
Yes.
When you have a string declared as var foo = 'foo' its type is the primitive string, having no properties inherently, but when you try and access a property on it, the primitive is wrapped momentarily in the String object through a process called implicit coercion.
See this article for a full explanation of coercion in JavaScript.
answered Nov 13 at 7:22
Vulcan
22.4k93976
Does that mean JS creates object wrappers for strings only when it calls methods / or accesses corresponding properties on them like
'string'.toUppercase()/'string'.length?
Yes.
When you have a string declared as var foo = 'foo' its type is the primitive string, having no properties inherently, but when you try and access a property on it, the primitive is wrapped momentarily in the String object through a process called implicit coercion.
See this article for a full explanation of coercion in JavaScript.
answered Nov 13 at 7:22
Vulcan
22.4k93976
answered Nov 13 at 7:22
Vulcan
22.4k93976
answered Nov 13 at 7:22
Vulcan
22.4k93976
answered Nov 13 at 7:22
Vulcan
22.4k93976
22.4k93976
1
Perhaps the answers to this question are a good addition: stackoverflow.com/q/17256182/10245948
– Hero Wanders
Nov 13 at 7:47
I just wanted to be sure that's wrapping does not occur upon any other circumstances.
– daGo
Nov 13 at 8:00
add a comment |
1
Perhaps the answers to this question are a good addition: stackoverflow.com/q/17256182/10245948
– Hero Wanders
Nov 13 at 7:47
I just wanted to be sure that's wrapping does not occur upon any other circumstances.
– daGo
Nov 13 at 8:00
1
1
Perhaps the answers to this question are a good addition: stackoverflow.com/q/17256182/10245948
– Hero Wanders
Nov 13 at 7:47
Perhaps the answers to this question are a good addition: stackoverflow.com/q/17256182/10245948
– Hero Wanders
Nov 13 at 7:47
I just wanted to be sure that's wrapping does not occur upon any other circumstances.
– daGo
Nov 13 at 8:00
I just wanted to be sure that's wrapping does not occur upon any other circumstances.
– daGo
Nov 13 at 8:00
add a comment |
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53275629%2fwhen-does-js-create-an-object-wrapper-for-a-string%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
