value === undefined vs typeof value === 'undefined' in node.js [duplicate]
This question already has an answer here:
How to check for “undefined” in JavaScript? [duplicate]
16 answers
variable === undefined vs. typeof variable === “undefined”
8 answers
I have little confusion in this. I am using Auth0 and writing rules which uses node.js syntax. Now I read somewhere that the right way to check undefined value in node is typeof value === 'undefined' but value === undefined also work in node. So what is the main difference in both of them?
javascript node.js auth0
asked Nov 14 '18 at 6:21
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marked as duplicate by deceze♦ javascript
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Nov 14 '18 at 6:24
This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.
add a comment |
This question already has an answer here:
How to check for “undefined” in JavaScript? [duplicate]
16 answers
variable === undefined vs. typeof variable === “undefined”
8 answers
I have little confusion in this. I am using Auth0 and writing rules which uses node.js syntax. Now I read somewhere that the right way to check undefined value in node is typeof value === 'undefined' but value === undefined also work in node. So what is the main difference in both of them?
javascript node.js auth0
asked Nov 14 '18 at 6:21
AskAsk
259114
marked as duplicate by deceze♦ javascript
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Nov 14 '18 at 6:24
This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.
Ifvalueis undeclared the second way would throw a ReferenceError. But other than that, it's the same thing.
– VLAZ
Nov 14 '18 at 6:24
Possible duplicate of : stackoverflow.com/questions/4725603/… Please see if this helps.
– Mayank Parnami
Nov 14 '18 at 6:24
@vlaz You mean the first way would throw too ..?
– Teemu
Nov 14 '18 at 6:26
@MayankParnami, aah sorry. My bad
– Ask
Nov 14 '18 at 6:38
add a comment |
This question already has an answer here:
How to check for “undefined” in JavaScript? [duplicate]
16 answers
variable === undefined vs. typeof variable === “undefined”
8 answers
I have little confusion in this. I am using Auth0 and writing rules which uses node.js syntax. Now I read somewhere that the right way to check undefined value in node is typeof value === 'undefined' but value === undefined also work in node. So what is the main difference in both of them?
javascript node.js auth0
asked Nov 14 '18 at 6:21
AskAsk
259114
This question already has an answer here:
How to check for “undefined” in JavaScript? [duplicate]
16 answers
variable === undefined vs. typeof variable === “undefined”
8 answers
I have little confusion in this. I am using Auth0 and writing rules which uses node.js syntax. Now I read somewhere that the right way to check undefined value in node is typeof value === 'undefined' but value === undefined also work in node. So what is the main difference in both of them?
This question already has an answer here:
How to check for “undefined” in JavaScript? [duplicate]
16 answers
variable === undefined vs. typeof variable === “undefined”
8 answers
javascript node.js auth0
javascript node.js auth0
asked Nov 14 '18 at 6:21
AskAsk
259114
asked Nov 14 '18 at 6:21
AskAsk
259114
asked Nov 14 '18 at 6:21
AskAsk
259114
asked Nov 14 '18 at 6:21
AskAsk
259114
asked Nov 14 '18 at 6:21
AskAsk
259114
259114
marked as duplicate by deceze♦ javascript
Users with the javascript badge can single-handedly close javascript questions as duplicates and reopen them as needed.
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Nov 14 '18 at 6:24
This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.
marked as duplicate by deceze♦ javascript
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Nov 14 '18 at 6:24
This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.
Ifvalueis undeclared the second way would throw a ReferenceError. But other than that, it's the same thing.
– VLAZ
Nov 14 '18 at 6:24
Possible duplicate of : stackoverflow.com/questions/4725603/… Please see if this helps.
– Mayank Parnami
Nov 14 '18 at 6:24
@vlaz You mean the first way would throw too ..?
– Teemu
Nov 14 '18 at 6:26
@MayankParnami, aah sorry. My bad
– Ask
Nov 14 '18 at 6:38
add a comment |
Ifvalueis undeclared the second way would throw a ReferenceError. But other than that, it's the same thing.
– VLAZ
Nov 14 '18 at 6:24
Possible duplicate of : stackoverflow.com/questions/4725603/… Please see if this helps.
– Mayank Parnami
Nov 14 '18 at 6:24
@vlaz You mean the first way would throw too ..?
– Teemu
Nov 14 '18 at 6:26
@MayankParnami, aah sorry. My bad
– Ask
Nov 14 '18 at 6:38
If
value is undeclared the second way would throw a ReferenceError. But other than that, it's the same thing.– VLAZ
Nov 14 '18 at 6:24
If
value is undeclared the second way would throw a ReferenceError. But other than that, it's the same thing.– VLAZ
Nov 14 '18 at 6:24
Possible duplicate of : stackoverflow.com/questions/4725603/… Please see if this helps.
– Mayank Parnami
Nov 14 '18 at 6:24
Possible duplicate of : stackoverflow.com/questions/4725603/… Please see if this helps.
– Mayank Parnami
Nov 14 '18 at 6:24
@vlaz You mean the first way would throw too ..?
– Teemu
Nov 14 '18 at 6:26
@vlaz You mean the first way would throw too ..?
– Teemu
Nov 14 '18 at 6:26
@MayankParnami, aah sorry. My bad
– Ask
Nov 14 '18 at 6:38
@MayankParnami, aah sorry. My bad
– Ask
Nov 14 '18 at 6:38
add a comment |
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If
valueis undeclared the second way would throw a ReferenceError. But other than that, it's the same thing.– VLAZ
Nov 14 '18 at 6:24
Possible duplicate of : stackoverflow.com/questions/4725603/… Please see if this helps.
– Mayank Parnami
Nov 14 '18 at 6:24
@vlaz You mean the first way would throw too ..?
– Teemu
Nov 14 '18 at 6:26
@MayankParnami, aah sorry. My bad
– Ask
Nov 14 '18 at 6:38