Recursively search object attributes

findVal.js

// From https://stackoverflow.com/questions/40603913/search-recursively-for-value-in-object-by-property-name
function findVal(obj, key) {
    var seen = new Set;
    var active = [obj];
    
    while (active.length) {
        var new_active = [];
        var found = [];

        for (var i=0 ; i<active.length ; i++) {
            Object.keys(active[i]).forEach(function(k) {
                try {
                var x = active[i][k];
                if (k === key) {
                    found.push(x);
                } 
                else if (x && typeof x === "object" && !seen.has(x)) {
                    seen.add(x);
                    new_active.push(x);
                }
            } catch(e) { console.log('Impossible to access property', k, 'of', active[i]); }
            });
        }
        if (found.length) return found;
        active = new_active;
    }
    return null;
}