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Test whether a value is a property key.
import isPropertyKey from 'https://cdn.jsdelivr.net/gh/stdlib-js/assert-is-property-key@esm/index.mjs';Tests whether a value is a property key.
var bool = isPropertyKey( 'beep' );
// returns true
bool = isPropertyKey( 3.14 );
// returns false- A valid property key is either a string, symbol, or a nonnegative integer. For example,
'beep',Symbol( 'beep' ), and3are all valid property keys. - Only primitive values are considered to be valid property keys. This excludes object wrappers such as
new String( 'beep' ).
<!DOCTYPE html>
<html lang="en">
<body>
<script type="module">
import Symbol from 'https://cdn.jsdelivr.net/gh/stdlib-js/symbol-ctor@esm/index.mjs';
import hasSymbolSupport from 'https://cdn.jsdelivr.net/gh/stdlib-js/assert-has-symbol-support@esm/index.mjs';
import isPropertyKey from 'https://cdn.jsdelivr.net/gh/stdlib-js/assert-is-property-key@esm/index.mjs';
var hasSymbols = hasSymbolSupport();
var bool = isPropertyKey( 'beep' );
// returns true
if ( hasSymbols ) {
bool = isPropertyKey( Symbol( 'beep' ) );
// returns true
} else {
console.log( 'Environment does not support symbols.' );
}
bool = isPropertyKey( 37 );
// returns true
bool = isPropertyKey( {} );
// returns false
bool = isPropertyKey( [] );
// returns false
</script>
</body>
</html>@stdlib/assert-is-string: test if a value is a string.@stdlib/assert-is-symbol: test if a value is a symbol.@stdlib/assert-is-nonnegative-integer: test if a value is a number having a nonnegative integer value.@stdlib/assert-has-own-property: test if an object has a specified property.@stdlib/assert-has-property: test if an object has a specified property, either own or inherited.
This package is part of stdlib, a standard library 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 © 2016-2025. The Stdlib Authors.
