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detj/isObject.js

Created October 2, 2025 09:57
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isObject(something)
Raw
isObject.js
// Check if 'something' is just a plain JavaScript object
// like a map of keys and values.
function isObject(something) {
const type = Object.prototype.toString.call(something);
return something === Object(something) && type !== "[object Array]" && type !== "[object Function]" && type !== "[object Date]" && type !== "[object RegExp]" && type !== "[object Set]" && type !== "[object Map]";
}
// truthy
console.log("{}", isObject({}));
console.log("Object.create(null)", isObject(Object.create(null)))
// falsy
console.log("function() {}", isObject(function() {}));
console.log("new Date()", isObject(new Date()));
console.log("[]", isObject([]));
console.log("new RegExp()", isObject(new RegExp()));
console.log("null", isObject(null));
console.log("undefined", isObject(undefined));
console.log("some text", isObject("some text"));
console.log("true", isObject(true));
console.log("5", isObject(5));
console.log("1n", isObject(1n));
console.log("Symbol(\"foo\")", isObject(Symbol("foo")));
console.log("new Set()", isObject(new Set()));
console.log("new Map()", isObject(new Map()));
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