filter multimethod

Methods

filter(e:Eachable1, predicate:Any) Source: stdlib.ngs:302

Filter e using predicate.

Parameters

e	Eachable1. WARNING: instances of same type as e must have empty constructor and push() method.
predicate	Decision function to be called with each item as first argument. When predicate(item) returns true, the item will appear in the resulting array.

Returns

Of same type as e

Example

(1...10).filter(F(num) num % 2 == 0)  # Gives [2,4,6,8,10]
(1...10).filter(X<5)  # Gives [1,2,3,4], predicate called as predicate(item, 5)

filter(something:Eachable1, field:Str, predicate:Any)deprecated Source: stdlib.ngs:317

DEPRECATED! Do not use! Use something.filter({field: predicate}) instead.

filter(e:Eachable1)deprecated Source: stdlib.ngs:442

Filter nulls out. DEPRECATED, USE something.without(null) INSTEAD.

Returns

Arr (array) of original items without nulls

filter(hl:HashLike, predicate:Fun) Source: stdlib.ngs:744

Filter hash. Build new HashLike with kev-value pairs selected by predicate.

Parameters

predicate

Test function to be called with one key and one value at a time.

Returns

HashLike

Example

my_hashlike.filter(F(k, v) k == 'a')

filter(h:Hash, predicate:Any) Source: stdlib.ngs:2419

Filter hash. Build new hash with kev-value pairs selected by predicate.

Parameters

h	Source hash
predicate	Test function to be called with one key and one value at a time

Example

{'a': 1, 'b': 2}.filter(F(k, v) k == 'a')  # {'a': 1}

filter(fb:FullBox, predicate:Any) Source: stdlib.ngs:2736

Conditionaly convert FullBox to EmptyBox.

Parameters

predicate

Test function to be called with the value in the FullBox

Returns

Box. fb if predicate succeeds, EmptyBox if not.

Example

Box(10).filter(X>5)   # <FullBox val=10>
Box(10).filter(X>20)  # <EmptyBox>

filter(eb:EmptyBox, predicate:Any) Source: stdlib.ngs:2744

Do nothing

Returns

eb

Example

EmptyBox().filter(X>20)  # <EmptyBox>

filter(s:Success, predicate:Any) Source: stdlib.ngs:2948

Run predicate on wrapped value.

Returns

s or Failure

Example

Success(10).filter(X>5)   # <Success val=10>
Success(10).filter(X>15)  # <Failure val=<ResultFail ...>>

filter(f:Failure, predicate:Any) Source: stdlib.ngs:2956

No-op, returns f

Returns

f

Example

Failure("blah").filter(X>5)  # <Failure val=blah>

filter(rd:ResDef, predicate:Fun) Source: autoload/Res.ngs:93

Create new resource definition by filtering resources of rd.

Parameters

rd	Original resource definition. Not modified.

Returns

ResDef

Example

# Get instances with last private IP octet less than 20:
AWS::Instance().filter({A.PrivateIpAddress.split(".")[-1].Int()<20})

filter(i:Iter, predicate:Fun) Source: autoload/Iter.ngs:181

EXPERIMENTAL! Do not use!

filter(ds:DelimStr, predicate:Any) Source: autoload/DelimStr.ngs:23

Get new DelimStr with some elements filtered out

Example

DelimStr("/bin:/usr/bin:/usr/local/bin").filter(/usr/).Str()  # "/usr/bin:/usr/local/bin"