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TakeWhile

TakeWhile[list, crit]
gives elements ei from the beginning of list, continuing so long as crit[ei] is True.
Take elements while they are all even:
In[1]:=
Click for copyable input
Out[1]=
 
Use a pure function to take elements while they are all below 10:
In[1]:=
Click for copyable input
Out[1]=
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