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@shopify/predicates

A set of common JavaScript predicates. The functions in this library either take one input and return true/false, or return a customized function that does so.

Installation

yarn add @shopify/predicates

API

Predicates

• isPositiveNumericString Returns true when its input is a positive numeric string and false otherwise.
• isNumericString Returns true when its input is a numeric string and false otherwise.
• isEmpty Returns true when its input is null, undefined, or has length 0.
• isEmptyString Returns true when it's input is an empty string or contains only whitespace.
• notEmpty Returns true when its input is not null, undefined or has length 0.
• notNumericString Returns true when its input is not a numeric string and false otherwise.

Predicate creators

• lengthMoreThan Given a number, returns a function that returns true when that input has length more than that number and false otherwise.
• lengthLessThan Given a number, returns a function that returns true when that input has length less than that number and false otherwise.

Helpers

• not Given a function that returns a boolean, returns a function that returns a boolean in the opposite cases.