what is the difference between isNaN and Number.isNaN? [duplicate]
This question already has an answer here:
Confusion between isNaN and Number.isNaN in javascript
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what is the difference between isNaN and Number.isNaN?
isNaN('hello world'); // returns 'true'.
Number.isNaN('hello world'); // returns 'false
javascript
asked Nov 19 '18 at 19:15
Eng Abdullah MorsyEng Abdullah Morsy
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marked as duplicate by Mark Meyer javascript
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Nov 19 '18 at 19:19
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This question already has an answer here:
Confusion between isNaN and Number.isNaN in javascript
4 answers
what is the difference between isNaN and Number.isNaN?
isNaN('hello world'); // returns 'true'.
Number.isNaN('hello world'); // returns 'false
javascript
asked Nov 19 '18 at 19:15
Eng Abdullah MorsyEng Abdullah Morsy
52
marked as duplicate by Mark Meyer javascript
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Nov 19 '18 at 19:19
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This question already has an answer here:
Confusion between isNaN and Number.isNaN in javascript
4 answers
what is the difference between isNaN and Number.isNaN?
isNaN('hello world'); // returns 'true'.
Number.isNaN('hello world'); // returns 'false
javascript
asked Nov 19 '18 at 19:15
Eng Abdullah MorsyEng Abdullah Morsy
52
This question already has an answer here:
Confusion between isNaN and Number.isNaN in javascript
4 answers
what is the difference between isNaN and Number.isNaN?
isNaN('hello world'); // returns 'true'.
Number.isNaN('hello world'); // returns 'false
This question already has an answer here:
Confusion between isNaN and Number.isNaN in javascript
4 answers
javascript
javascript
asked Nov 19 '18 at 19:15
Eng Abdullah MorsyEng Abdullah Morsy
52
asked Nov 19 '18 at 19:15
Eng Abdullah MorsyEng Abdullah Morsy
52
asked Nov 19 '18 at 19:15
Eng Abdullah MorsyEng Abdullah Morsy
52
asked Nov 19 '18 at 19:15
Eng Abdullah MorsyEng Abdullah Morsy
52
asked Nov 19 '18 at 19:15
Eng Abdullah MorsyEng Abdullah Morsy
52
52
marked as duplicate by Mark Meyer javascript
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The spec is a good place to turn for this kind of subtlety. isNaN tries to convert its argument to a number; Number.isNaN doesn't, it returns false if the type of its argument isn't "number". So:
console.log(isNaN("%")); // true, coerced to number and result was NaN
console.log(Number.isNaN("%")); // false, not coercedanswered Nov 19 '18 at 19:18
T.J. CrowderT.J. Crowder
687k12112221315
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1 Answer
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1 Answer
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The spec is a good place to turn for this kind of subtlety. isNaN tries to convert its argument to a number; Number.isNaN doesn't, it returns false if the type of its argument isn't "number". So:
console.log(isNaN("%")); // true, coerced to number and result was NaN
console.log(Number.isNaN("%")); // false, not coercedanswered Nov 19 '18 at 19:18
T.J. CrowderT.J. Crowder
687k12112221315
add a comment |
The spec is a good place to turn for this kind of subtlety. isNaN tries to convert its argument to a number; Number.isNaN doesn't, it returns false if the type of its argument isn't "number". So:
console.log(isNaN("%")); // true, coerced to number and result was NaN
console.log(Number.isNaN("%")); // false, not coercedanswered Nov 19 '18 at 19:18
T.J. CrowderT.J. Crowder
687k12112221315
add a comment |
The spec is a good place to turn for this kind of subtlety. isNaN tries to convert its argument to a number; Number.isNaN doesn't, it returns false if the type of its argument isn't "number". So:
console.log(isNaN("%")); // true, coerced to number and result was NaN
console.log(Number.isNaN("%")); // false, not coercedanswered Nov 19 '18 at 19:18
T.J. CrowderT.J. Crowder
687k12112221315
The spec is a good place to turn for this kind of subtlety. isNaN tries to convert its argument to a number; Number.isNaN doesn't, it returns false if the type of its argument isn't "number". So:
console.log(isNaN("%")); // true, coerced to number and result was NaN
console.log(Number.isNaN("%")); // false, not coercedconsole.log(isNaN("%")); // true, coerced to number and result was NaN
console.log(Number.isNaN("%")); // false, not coercedconsole.log(isNaN("%")); // true, coerced to number and result was NaN
console.log(Number.isNaN("%")); // false, not coercedanswered Nov 19 '18 at 19:18
T.J. CrowderT.J. Crowder
687k12112221315
answered Nov 19 '18 at 19:18
T.J. CrowderT.J. Crowder
687k12112221315
answered Nov 19 '18 at 19:18
T.J. CrowderT.J. Crowder
687k12112221315
answered Nov 19 '18 at 19:18
T.J. CrowderT.J. Crowder
687k12112221315
687k12112221315
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