Skip to content

is-inherited-property

Directory actions

More options

Directory actions

More options

Latest commit

 

History

History

is-inherited-property

Folders and files

NameName
Last commit message
Last commit date

parent directory

..
benchmark
benchmark
 
 
docs
docs
 
 
examples
examples
 
 
lib
lib
 
 
test
test
 
 
README.md
README.md
 
 
package.json
package.json
 
 

README.md

isInheritedProperty

Test if an object has an inherited property.

Usage

var isInheritedProperty = require( '@stdlib/assert/is-inherited-property' );

isInheritedProperty( value, property )

Returns a boolean indicating if a value has an inherited property.

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

var bool = isInheritedProperty( obj, 'beep' );
// returns false

bool = isInheritedProperty( obj, 'hasOwnProperty' );
// returns true

bool = isInheritedProperty( obj, 'bap' );
// returns false

Notes

  • The function does not throw when provided null or undefined. Instead, the function returns false.

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

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

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

    var bool = isInheritedProperty( 'beep', 'toString' );
// returns true

  • Non-symbol property arguments are coerced to strings.

    function Foo() {
    return this;
}

Foo.prototype.null = true;
Foo.prototype[ '[object Object]' ] = true;

var obj = new Foo();

var bool = isInheritedProperty( obj, null );
// returns true

bool = isInheritedProperty( obj, {} );
// returns true

Examples

var isInheritedProperty = require( '@stdlib/assert/is-inherited-property' );

var bool = isInheritedProperty( {}, 'hasOwnProperty' );
// returns true

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

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

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

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

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

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

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

See Also