JVM is the head of an expression that identifies a particular Java runtime installed into the current Mathematica session via InstallJava.

TakeWhile[list, crit] gives elements e_i from the beginning of list, continuing so long as crit[e_i] is True.

Count[list, pattern] gives the number of elements in list that match pattern. Count[expr, pattern, levelspec] gives the total number of subexpressions matching pattern that ...

NotebookGet[obj] gets the raw expression corresponding to the notebook represented by the notebook object obj. NotebookGet[] gets the raw expression corresponding to the ...

ReplacePart[expr, i -> new] yields an expression in which the i\[Null]\[Null]^th part of expr is replaced by new. ReplacePart[expr, {i_1 -> new_1, i_2 -> new_2, ...}] ...

Apply[f, expr] or f @@ expr replaces the head of expr by f. Apply[f, expr, {1}] or f @@@ expr replaces heads at level 1 of expr by f.Apply[f, expr, levelspec] replaces heads ...

Mathematica expressions provide a very general way to handle all kinds of data, and you may sometimes want to use such expressions inside your external programs. A language ...

CheckAbort[expr, failexpr] evaluates expr, returning failexpr if an abort occurs.

First[expr] gives the first element in expr.

ImageQ[image] yields True if image has the form of a valid Image object, and False otherwise.