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Idiom #329 Read value in a map

Assign to v the value stored in the map m for the key k.

Explain what happens if there is no entry for k in m.

v := m[k]
v, ok := m[k]
v = m.get(k);
$v = $m{$k};
$v = $m{$k} // 'foobar';
v = m[k]
v = m.get(k, "default value")
v = m.get(k)
v = m[k]

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