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Elegant, highly efficient data validation for JavaScript


Overview

  • Provides concise, performant, readable, data and type validation for JavaScript apps, using built-in and user-defined data-validating pseudo types.
  • Improves application efficiency and readability by unifying the most basic but common data and type validations in JavaScript apps, into single, concise, highly optimized operations.
  • Employs bitwise operations, data pre-processing, and memory-efficient memoization for fast, robust performance in small and large apps and libraries.
  • Ready for nodejs, requirejs, and regular script tag.
  • Website – xtype.js.org

Go from this:

function searchEmployees(value) {
    if (typeof value === 'string') {
         if (value.trim().length > 1) {
            return EmployeeDB.searchByName(value);
        } else if (value.trim().length === 1) {
            return EmployeeDB.searchByMiddleInitial(value);
        } else {
            return { error: 'Invalid search value supplied' };
        }
    } else if (typeof value === 'object' && value !== null) {
        if (Object.keys(value).length === 1) {
            return EmployeeDB.searchByFieldValuePair(value);
        } else if (Object.keys(value).length > 1) {
            return { error: 'Search by multiple fields not supported' };
        } else {
            return { error: 'Invalid search value supplied' };
        }
    } else if (typeof value === 'number') {
        if (!isNaN(value) && isFinite(value) && value > 0 && value % 1 === 0) {
            return EmployeeDB.searchByEmployeeNumber(value);
        } else {
            return { error: 'Invalid employee number supplied' };
        }
    } else if (typeof value === 'undefined' || value === null) {
        return { error: 'No search value supplied' };
    } else {
        return { error: 'Invalid search value supplied' };
    }
}

To concise, performant, readable, data validation:

function searchEmployees(value) {
    switch (xtype.which(value, 'str2+ str1 int+ obj1 obj2+ num nil')) {
        case 'str2+':
            return EmployeeDB.searchByName(value);
        case 'str1':
            return EmployeeDB.searchByMiddleInitial(value);
        case 'int+':
            return EmployeeDB.searchByEmployeeNumber(value);
        case 'obj1':
            return EmployeeDB.searchByFieldValuePair(value);
        case 'obj2+':
            return { error: 'Search by multiple fields not supported' };
        case 'num':
            return { error: 'Invalid employee number supplied' };
        case 'nil':
            return { error: 'No search value supplied' };
        default:
            return { error: 'Invalid search value supplied' };
    }
}

And even add custom validation types of your own:

xtype.ext.registerType('ssn', {
    validator: function(val) {
        return typeof val === 'string' && /^\d{3}-\d{2}-\d{4}$/.test(val);
    }
});

function searchEmployees(value) {
    switch (xtype.which(value, 'positive_integer, ssn, multi_char_string')) {
        case 'positive_integer':
            return EmployeeDB.searchByEmployeeNumber(value);
        case 'ssn':
            return EmployeeDB.searchBySSN(value);
        case 'multi_char_string':
            return EmployeeDB.searchByName(value);
        default:
            return { error: 'Invalid search value supplied' };
    }
}

 

Links

Installation

See here.

Dependencies

None.

Build / Test

See here.

License

MIT license.

Website

Visit the website for usage guide, examples, API docs, and installation.

xtype.js.org


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