Stringsuch

Stringsuch is a conceptual function in programming languages used to select strings from a collection that satisfy a given predicate. It is analogous to a filter operation applied specifically to strings, and is sometimes described in literature as a string-specific variant of select or grep.

Typically, stringsuch accepts two arguments: an iterable of strings and a predicate function that takes a string and returns a boolean. The function returns a new collection of strings that for which the predicate is true. Implementations may offer options such as case sensitivity, exact matching, substring matching, wildcard patterns, or regular expressions, and may choose to evaluate lazily or eagerly.

Example: If the input is ['apple','banana','apricot','berry'] and the predicate is a test for strings starting with 'ap', stringsuch would yield ['apple','apricot'].

Considerations: Performance depends on the cost of the predicate and whether the input is indexed. Lazy implementations can enable streaming processing of large datasets. The name stringsuch is not standardized and varies across languages; some libraries provide similar functionality under names like filter, where, select, or grep.

See also: filter function, grep, where clause, query language operators.