types

Advanced type checking and validation utilities.

Functions

Function	Description	Example
of	Get the type of a value	dphelper.types.of(value)
instOfObj	Check if value is Object instance	dphelper.types.instOfObj(value)
isNaN	Check if value is NaN	dphelper.types.isNaN(value)
isBool	Check if value is boolean	dphelper.types.isBool(value)

Description

Advanced type utilities:

• Type Detection - Get precise type of any value

• Boolean Check - Detect boolean values (including string booleans)

• Object Check - Verify object instances

Usage Examples

Get Type

// Get type of value
console.log(dphelper.types.of('hello'));     // "string"
console.log(dphelper.types.of(123));        // "number"
console.log(dphelper.types.of(true));       // "boolean"
console.log(dphelper.types.of({}));         // "object"
console.log(dphelper.types.of([]));         // "object"
console.log(dphelper.types.of(null));       // "null"
console.log(dphelper.types.of(undefined));  // "undefined"

Check Object Instance

// Check if value is Object instance
console.log(dphelper.types.instOfObj({}));           // true
console.log(dphelper.types.instOfObj([]));           // true
console.log(dphelper.types.instOfObj(new Date()));    // true
console.log(dphelper.types.instOfObj('string'));     // false
console.log(dphelper.types.instOfObj(123));          // false

Check NaN

// Check for NaN
console.log(dphelper.types.isNaN(NaN));              // true
console.log(dphelper.types.isNaN(0/0));              // true
console.log(dphelper.types.isNaN('hello'));          // false
console.log(dphelper.types.isNaN(123));             // false

Check Boolean

// Check if boolean (including string representations)
console.log(dphelper.types.isBool(true));     // true
console.log(dphelper.types.isBool(false));    // true
console.log(dphelper.types.isBool(1));       // false
console.log(dphelper.types.isBool('true'));  // false
console.log(dphelper.types.isBool(null));    // true
console.log(dphelper.types.isBool(undefined));// true

Form Validation

// Type-safe form validation
function validateField(value, type) {
  const actualType = dphelper.types.of(value);

  if (type === 'string' && actualType !== 'string') {
    return { valid: false, error: 'Must be a string' };
  }

  if (type === 'number' && actualType !== 'number') {
    return { valid: false, error: 'Must be a number' };
  }

  if (type === 'boolean' && !dphelper.types.isBool(value)) {
    return { valid: false, error: 'Must be a boolean' };
  }

  return { valid: true };
}

Details

• Author: Dario Passariello

• Version: 0.0.2

• Creation Date: 20210101

• Last Modified: 20260220

• Environment: both (browser + Node.js)

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