Simple utitly function to inspect JavaScript a variable

printVar.js

    function printVar(ob, tc = 0) {
        tc += 1
        const tabs = '\t'.repeat(tc)

        const prototypes = (ob) => {
            let res = ''
            for (const e of Object.getOwnPropertyNames(ob.prototype)) {
                if (e === 'constructor') {
                    res += e
                } else {
                    res += log(ob.prototype[e], tc + 1)
                }
            }
            return res
        }
        if (Function.prototype.isPrototypeOf(ob)) {
            return ` f(${ob.name})\n${tabs}<prototype> ${ob.prototype === undefined ? 'Native' : prototypes(ob)}`
        }
        if (ob === Object.prototype) {
            return "{Object.prototype}"
        }
        if (!Object.prototype.isPrototypeOf(ob)) {
            return ob
        }
        let res = `\n${tabs}[${ob.constructor.name}]\n`
        for (let p of Object.getOwnPropertyNames(ob)) {
            res += `${tabs}${p}:${log(ob[p], tc + 1)}\n`
        }
        res += `${tabs}__proto__:${log(ob.__proto__, tc + 1)}`
        return res
    }


// Usage

console.log(log(new function Dog(){}))

// Prints
//	[Dog]
//	__proto__:
//			[Dog]
//			constructor: f(Dog)
//					<prototype> constructor
//			__proto__:{Object.prototype}