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add functions second, penult

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Pekka Laiho 2020-06-08 10:02:59 +07:00
parent 200d9b3161
commit ddac856ed4
1 changed files with 10 additions and 4 deletions
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12
src/Lib/Collections.php
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@ -70,13 +70,19 @@ class Collections implements ILib
fn (Seq $a) => $a->getData()[0] ?? null
));
$env->set('second', new CoreFunc('second', 'Return the second element of a sequence or null.', 1, 1,
fn (Seq $a) => $a->getData()[1] ?? null
));
$env->set('last', new CoreFunc('last', 'Return the last element of a sequence or null.', 1, 1,
function (Seq $a) {
if ($a->count() == 0) {
return null;
return $a->getData()[$a->count() - 1] ?? null;
}
));
return $a->getData()[$a->count() - 1];
$env->set('penult', new CoreFunc('penult', 'Return the second last element of a sequence or null.', 1, 1,
function (Seq $a) {
return $a->getData()[$a->count() - 2] ?? null;
}
));