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Last

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Last[expr]

returns the last element in expr.

Last[expr, def]

returns the last element in expr if it exists or def otherwise.

Last[expr] is equivalent to expr[[-1]].

• • Last[{a, b, c}]

The first argument need not be a list:

• • Last[a + b + c]

However, the first argument must be Nonatomic when there is a single argument:

• • Last[10]

Or if it is not, but a second default argument is provided, that is evaluated and returned:

• • Last[10, 1+2]

• • Last[{}]

  • {} has zero length and no last element.

  • $$\mathrm{Last}\left[\left\{\right\}\right]$$

As before, the first argument is empty, but since default argument is given, evaluate and return the second argument:

• • Last[{}, 1+2]