I started by taking a look at this question. But this was using their own typing. I am doing a forof object.entries. I have a set of values like below, I have found that I have to check the instance of to access functions on that type of object. Which make sense for all but string. I have to use String for instanceof string but then I get errors because String isn't assignable to string. So I am lost on what to do, or if there is a better way to do this.

    const value = 
    {
        EnableDataMining: 1, EnableReassembly: 0, Alarm: [1,2,3],
        AllowQuery: 1, AllowDrilldown: 1, MessageType: ["sms", "msm","carrier pidgeon"],
        AllowBypass: 0, Bybass: (1) [false, "01/01/1970"]
    }

    for(const [k, v] of Object.entries(value))
    {
        th.headers = td.headers = th.textContent = key;
                    
        if(v instanceof Array) v.map(i => td.textContent = i);
        if(v instanceof Number) td.textContent = v.toString();
        if(v instanceof String) td.textContent = v;

        console.log(k, v);
    }

CodePudding user response：

The correct way to check if v is a string (or a number) is to use typeof:

if (typeof v === "number") td.textContent = v.toString();
if (typeof v === "string") td.textContent = v;

Note that "string" and "number" are in quotes. typeof v gives you a string that you need to check.