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Update cast_list.md

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Angelos Chalaris
2019-10-09 13:14:32 +03:00
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parent 1387344dc9
commit fe368c3673
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snippets/cast_list.md
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@ -5,17 +5,15 @@ tags: utility,list,beginner
Casts the provided value as an array if it's not one. Casts the provided value as an array if it's not one.
Use `isinstance()` to check if the given value is a list and return it as-is or encapsulated in a list accordingly. Use `isinstance()` to check if the given value is enumerable and return it by using `list()` or encapsulated in a list accordingly.
```py ```py
def cast_list(val): def cast_list(val):
if isinstance(val, (tuple, list, set, dict)): return list(val) return list(val) if isinstance(val, (tuple, list, set, dict)) else [val]
elif val: return [val]
else: return []
``` ```
```py ```py
cast_list('foo'); # ['foo'] cast_list('foo') # ['foo']
cast_list([1]); # [1] cast_list([1]) # [1]
cast_list(('foo', 'bar')); # ['foo', 'bar'] cast_list(('foo', 'bar')) # ['foo', 'bar']
``` ```