javascript check if dictionary

Question

I have a simple program like:

var a = {\'a\': 1, \'b\': 2}
console.log(a)
console.log(a instanceof Array)
console.log(a.constructor instanceof Array)
         


        

Answer 1

To be more rigorous you can use JSON. But it's not a performance & memory efficient solution:

function isJsonable(v) {
    try{
        return JSON.stringify(v) === JSON.stringify(JSON.parse(JSON.stringify(v)));
     } catch(e){
        /*console.error("not a dict",e);*/
        return false;
    }
}

So the answer can be: (note that it is an inefficient method and is recommended for test purposed only)

function isDict(v) {
    return !!v && typeof v==='object' && v!==null && !(v instanceof Array) && !(v instanceof Date) && isJsonable(v);
}