About stdlib...
We believe in a future in which the web is a preferred environment for numerical computation. To help realize this future, we've built stdlib. stdlib is a standard library, with an emphasis on numerical and scientific computation, written in JavaScript (and C) for execution in browsers and in Node.js.
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Test if an object's own property is writable.
npm install @stdlib/assert-is-writable-property
var isWritableProperty = require( '@stdlib/assert-is-writable-property' );
Returns a boolean
indicating if a value
has a writable property
.
var defineProperty = require( '@stdlib/utils-define-property' );
var obj = {
'foo': 'bar'
};
defineProperty( obj, 'beep', {
'configurable': false,
'enumerable': false,
'writable': false,
'value': 'boop'
});
defineProperty( obj, 'setter', {
'configurable': false,
'enumerable': false,
'set': function setter( v ) {
obj.foo = v;
}
});
var bool = isWritableProperty( obj, 'foo' );
// returns true
bool = isWritableProperty( obj, 'setter' );
// returns true
bool = isWritableProperty( obj, 'beep' );
// returns false
-
Value arguments other than
null
orundefined
are coerced toobjects
.var bool = isWritableProperty( 'beep', 'length' ); // returns false
-
Property arguments are coerced to
strings
.var obj = { 'null': 'foo' }; var bool = isWritableProperty( obj, null ); // returns true
var isWritableProperty = require( '@stdlib/assert-is-writable-property' );
var bool = isWritableProperty( [ 'a' ], 'length' );
// returns true
bool = isWritableProperty( { 'a': 'b' }, 'a' );
// returns true
bool = isWritableProperty( [ 'a' ], 0 );
// returns true
bool = isWritableProperty( { 'null': false }, null );
// returns true
bool = isWritableProperty( { '[object Object]': false }, {} );
// returns true
bool = isWritableProperty( {}, 'toString' );
// returns false
bool = isWritableProperty( {}, 'hasOwnProperty' );
// returns false
bool = isWritableProperty( null, 'a' );
// returns false
bool = isWritableProperty( void 0, 'a' );
// returns false
-
@stdlib/assert-is-readable-property
: test if an object's own property is readable. -
@stdlib/assert-is-read-write-property
: test if an object's own property is readable and writable. -
@stdlib/assert-is-writable-property-in
: test if an object's own or inherited property is writable. -
@stdlib/assert-is-write-only-property
: test if an object's own property is write-only.
This package is part of stdlib, a standard library for JavaScript and Node.js, with an emphasis on numerical and scientific computing. The library provides a collection of robust, high performance libraries for mathematics, statistics, streams, utilities, and more.
For more information on the project, filing bug reports and feature requests, and guidance on how to develop stdlib, see the main project repository.
See LICENSE.
Copyright © 2016-2024. The Stdlib Authors.