>
> I have array of coordinates, I want to search a marker point to check 
> whether its in the array of coordinate or not
>
 
You could write some javascript to do compare coordinates, it's not really 
an API question.
But you might like to think about what "same" means here,  Depending on the 
source(s) of your coordinates, there may be rounding errors or other small 
changes representing just a few mm difference in position.  Would you want 
that to be seen as "the same" or not?
You could calculate the distance between your 'target' and each item in the 
list, and only take the one(s) within some distance that you specify to be 
"close enough" for your purpose.
 

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