Eachable2 type

Eachable which each() calls the callback with two arguments

Direct parent types

Eachable: Parent type of all types that have each() method
Direct subtypes: 2

Direct children types

Hash: Hash type. Maps unique keys to their values. Key-Value pairs are stored and iterated in insertion order. Currently Hash type has several limitations: Hash keys are hashed using internal hash() function which can not be overwritten. The internal hash() multimethod exposed to NGS code but adding methods to it or setting "hash" to some other function will not affect operation of Hashes. Hash values are compared using internal is_equal() function which can not be overwritten. Both hash() and is_equal() currently handle only Int, Str and arbitrary objects. Comparison of arbitrary objects is done by comparing their addresses in memory.

HashLike: Base type for user-defined hash-like types. This is a workaround: it's not possible currently no inherit from the built-in Hash type.
Direct subtypes: 2

Methods

count(e:Eachable2, predicate:Any) Source: stdlib.ngs:2464

Count number of key-value pairs in Hash that satisfy the predicate.

Parameters

e	Something to check, typically a Hash
predicate	Test function to be called with one key and one value at a time

Returns

Int

Example

{'a': 1, 'b': 2, 'c': 11}.count(F(k, v) v>10)  # 1

filterk(h:Eachable2, predicate:Any) Source: stdlib.ngs:2434

Filter hash by keys, keeping matched

Example

{"a": 1, "b": 2, "ccc": 3}.filterk(/^.$/)    # {a=1, b=2}
{"aa": 1, "ab": 2, "ba": 3}.filterk(/^a/)    # {aa=1, ab=2}
{"aa": 1, "ab": 2, 10: 3}.filterk(Int)       # {10=3}
{10: "a", 20: "b", 30: "c"}.filterk(X > 10)  # {20=b, 30=c}

filterv(h:Eachable2, predicate:Any) Source: stdlib.ngs:2447

Filter hash by values

Example

{"a1": 1, "a2": 2, "b1": 10}.filterv(X>5)  # {"b1": 10}

rejectk(h:Eachable2, predicate:Any) Source: stdlib.ngs:2440

Filter hash by keys, removing matched. See filterk().

Example

{"a1": 1, "a2": 2, "b1": 10}.rejectk(/^b/)  # {"a1": 1, "a2": 2}

rejectv(h:Eachable2, predicate:Any) Source: stdlib.ngs:2453: Filter hash by values

without(e:Eachable2, without_k:Any) Source: stdlib.ngs:2547

Filter out specific key

Parameters

e	Source
without_k	The key to filter out

Example

{'a': 1, 'b': 2, 'c': 3}.without('a')  # {'b': 2, 'c': 3}

without(e:Eachable2, without_k:Any, without_v:Any) Source: stdlib.ngs:2557

Filter out specific key-value pair

Parameters

e	Source
without_k	The key to filter out
without_v	The value to filter out

Example

{'a': 1, 'b': 2, 'c': 3}.without('a', 1).without('b', 22)  # {'b': 2, 'c': 3}