2
$\begingroup$

Suppose I have the following list:

l={{{1},{2}},{{3}},{{4},{5}}};

How can I flatten this such that I get:

{{1,2},{3},{4,5}}

I tried Flatten[l, 1] but that gives:

{{1}, {2}, {3}, {4}, {5}}
$\endgroup$
2
$\begingroup$
Flatten[#, 1] & /@ l   

{{1, 2}, {3}, {4, 5}}

$\endgroup$
4
$\begingroup$
Flatten[l, {3, 1}]

{{1, 2}, {3}, {4, 5}}

Also

Flatten /@ l
Flatten[l, {{3, 1}}]
Join @@@ l

all give

{{1, 2}, {3}, {4, 5}}

$\endgroup$

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