Awesome article, Ifeoluwa ...
For checking that the properties of the user object exist and are valid, the following IF statement would work:
if (!!user.name && !!user.age && !!user.email && !!user.level) { // ... do stuff }
The double negation represents the property reference as a Boolean. If undefined, 0 or null, it would give false. Else, it would return true.
Boolean
undefined
0
null
false
true
It should work even when the properties do not exist.
Wow, this is so cool. I've never come across this. I knew there would be a better way.
Thanks a lot, Time Traveller :)
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Awesome article, Ifeoluwa ...
For checking that the properties of the user object exist and are valid, the following IF statement would work:
The double negation represents the property reference as a
Boolean. Ifundefined,0ornull, it would givefalse. Else, it would returntrue.It should work even when the properties do not exist.
Wow, this is so cool. I've never come across this. I knew there would be a better way.
Thanks a lot, Time Traveller :)