isNonConfigurableProperty

Test if an object's own property is non-configurable.

Usage

var isNonConfigurableProperty = require( '@stdlib/assert/is-nonconfigurable-property' );

isNonConfigurableProperty( value, property )

Returns a boolean indicating if a value has a non-configurable property (i.e., a property which cannot be deleted and whose descriptor cannot be changed).

var defineProperty = require( '@stdlib/utils/define-property' ); var obj = { 'foo': 'bar' }; defineProperty( obj, 'beep', { 'configurable': false, 'enumerable': true, 'writable': true, 'value': 'boop' }); var bool = isNonConfigurableProperty( obj, 'beep' ); // returns true bool = isNonConfigurableProperty( obj, 'foo' ); // returns false

Notes

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

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

Examples

var isNonConfigurableProperty = require( '@stdlib/assert/is-nonconfigurable-property' ); var bool = isNonConfigurableProperty( [ 'a' ], 'length' ); // returns true bool = isNonConfigurableProperty( { 'a': 'b' }, 'a' ); // returns false bool = isNonConfigurableProperty( [ 'a' ], 0 ); // returns false bool = isNonConfigurableProperty( {}, 'toString' ); // returns false bool = isNonConfigurableProperty( {}, 'hasOwnProperty' ); // returns false bool = isNonConfigurableProperty( null, 'a' ); // returns false bool = isNonConfigurableProperty( void 0, 'a' ); // returns false bool = isNonConfigurableProperty( { 'null': false }, null ); // returns false bool = isNonConfigurableProperty( { '[object Object]': false }, {} ); // returns false