Javascript check multidimensional array if keys exists

Question

Hello I need to check 3 - dimensional json array, now I check it like this

if(events[dd][mm][rr] !== undefined){}

but if keys doesn't exists it throw's me an error. TypeError: events[dd] is undefined

I need some JS function to check if this condition is exists and throught error of TypeError. Thank you.

Shilly · Accepted Answer · 2015-10-26 14:42:58Z

2

You'll have to check for each nested namespace. You could also write a recursive function if needed, if you have to check deeper into the map later on.

if (events[dd] && events[dd][mm] && events[dd][mm][rr] !== undefined) {}

answered Oct 26, 2015 at 14:42

Shilly

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dcode · Accepted Answer · 2015-10-26 15:12:16Z

0

Maybe use something like this:

function mdArrayExists(arr, var_args) {
    for (var i=1, k=arguments.length; i<k; ++i) {
        if (!arr || !arr.hasOwnProperty(arguments[i])
            return false;
        arr = arr[arguments[i]];
    }
    return true;
}

Usage:

if (mdArrayExists(events, dd, mm, rr) ...

answered Oct 26, 2015 at 15:12

dcode

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Mark · Accepted Answer · 2015-10-26 16:47:01Z

0

I have no affiliation with this company, but whenever I need to do Array Searching work I use the underscore.js library for doing it, because it has a bunch of functions for finding data quickly, and performance wise seems to be better about overhead then if I have to iterate over arrays myself.

answered Oct 26, 2015 at 16:47

Mark

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