type

Utilities for type checking.

Functions

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

Description

Type checking utilities:

• Type Detection - Get precise type of any value

• Boolean Check - Detect boolean values

• NaN Detection - Identify NaN values

• Object Check - Verify object instances

Usage Examples

Get Type

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

Check Object Instance

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

Check NaN

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

// Safe number validation
function isValidNumber(value) {
  return !dphelper.type.isNaN(value) && dphelper.type.of(value) === 'number';
}

Check Boolean

// Check if boolean
console.log(dphelper.type.isBool(true));    // true
console.log(dphelper.type.isBool(false));  // true
console.log(dphelper.type.isBool(1));      // false
console.log(dphelper.type.isBool('true')); // false

// Boolean coercion check
function isExplicitBoolean(value) {
  return dphelper.type.isBool(value);
}

Type Guard Functions

// Comprehensive type checking
function getTypeInfo(value) {
  return {
    type: dphelper.type.of(value),
    isObject: dphelper.type.instOfObj(value),
    isNaN: dphelper.type.isNaN(value),
    isBoolean: dphelper.type.isBool(value)
  };
}

console.log(getTypeInfo(42));
// { type: 'number', isObject: false, isNaN: false, isBoolean: false }

console.log(getTypeInfo({a: 1}));
// { type: 'object', isObject: true, isNaN: false, isBoolean: false }

Details

• Author: Dario Passariello

• Version: 0.0.2

• Creation Date: 20210101

• Last Modified: 20260220

• Environment: both (browser + Node.js)

---

Automatically generated document