hasOwnProperty

Test if an object has a specified property.

Usage

var hasOwnProp = require( '@stdlib/assert/has-own-property' );

hasOwnProp( value, property )

Returns a boolean indicating if a value has a specified property.

var value = {
    'beep': 'boop'
};

var bool = hasOwnProp( value, 'beep' )
// returns true

bool = hasOwnProp( value, 'bap' );
// returns false

Notes

• In contrast to the native Object.prototype.hasOwnProperty, this function does not throw when provided null or undefined. Instead, the function returns false.

  var bool = hasOwnProp( null, 'a' );
  // returns false
  
  bool = hasOwnProp( void 0, 'a' );
  // returns false

• Value arguments other than null or undefined are coerced to objects.

  var bool = hasOwnProp( 'beep', 'length' );
  // returns true

• Property arguments are coerced to strings.

  var value = {
      'null': false
  };
  var bool = hasOwnProp( value, null );
  // returns true
  
  value = {
      '[object Object]': false
  };
  bool = hasOwnProp( value, {} );
  // returns true

Examples

var hasOwnProp = require( '@stdlib/assert/has-own-property' );

var bool = hasOwnProp( {'a':'b'}, 'a' );
// returns true

bool = hasOwnProp( {'a':'b'}, 'c' );
// returns false

bool = hasOwnProp( {'a':'b'}, null );
// returns false

bool = hasOwnProp( {}, 'hasOwnProperty' );
// returns false

bool = hasOwnProp( null, 'a' );
// returns false

bool = hasOwnProp( void 0, 'a' );
// returns false

bool = hasOwnProp( {'null':false}, null );
// returns true

bool = hasOwnProp( {'[object Object]':false}, {} );
// returns true