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\$\begingroup\$ That's a genius use of this quirk. +1 \$\endgroup\$

ETHproductions
– ETHproductions

2015-12-22 21:05:51 +00:00
Commented Dec 22, 2015 at 21:05
\$\begingroup\$ Warning: these are not always equivalent: isNaN("string") returns true, whereas "string"!="string" returns false (obviously) \$\endgroup\$

Cyoce
– Cyoce

2016-02-10 22:18:46 +00:00
Commented Feb 10, 2016 at 22:18
\$\begingroup\$ In many cases, you can even go for if(!x){, if you are detecting NaN explicitly. \$\endgroup\$

SE - stop firing the good guys
– SE - stop firing the good guys

2016-08-09 21:24:31 +00:00
Commented Aug 9, 2016 at 21:24
\$\begingroup\$ More specifically, x!=x returns true only for NaN. \$\endgroup\$

ETHproductions
– ETHproductions

2016-12-01 19:15:03 +00:00
Commented Dec 1, 2016 at 19:15
3

\$\begingroup\$ Casting x to number, +x!=+x, makes it equivalent to isNaN(x), yet still 2 characters shorter. Then, +"string"!=+"string" returns true. \$\endgroup\$

Tomas Langkaas
– Tomas Langkaas

2017-09-08 19:50:42 +00:00
Commented Sep 8, 2017 at 19:50

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Correct minor typos or mistakes
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create code fences with backticks ` or tildes ~
```
like so
```
add language identifier to highlight code
```python
def function(foo):
print(foo)
```
put returns between paragraphs
for linebreak add 2 spaces at end
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indent code by 4 spaces
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quote by placing > at start of line
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