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Keff
Keff

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Is Value an Object

#javascript #snippets

Little function to check if a value is an object:

function isObject(val){ return ( val != null && typeof val === 'object' && Array.isArray(val) === false ); }
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Notice that Date, RegExp, etc.. will pass the check.

Top comments (5)

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patarapolw profile image
Pacharapol Withayasakpunt • • Edited

For "plain" object, I rely on

function isObject(val){ return ( !!val && typeof val === 'object' && val.constructor === Object // Or val.toString() === '[object Object]' ); }
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ionellupu profile image
Ionel Cristian Lupu • • Edited

This won't work for class instances:

class User{} const user = new User; isObject(user); //false
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patarapolw profile image
Pacharapol Withayasakpunt •

This is just what "plain" object is.

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wheatup profile image
Hao •

Or abuse JSON.stringify

const isObject = val => JSON.stringify(val).startsWith('{');
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nombrekeff profile image
Keff •

Nice! Haven't seen this approach before :)