some js additions

gistfile1.js

Array.prototype.update = function(list) {
    if (list instanceof Array) {
        for (n of list) {
            var updated = false;
            for(var i=0; i< this.length; i++) {
                if (n.name == this[i].name) {this[i] = n; updated = true; break;}
            };
            if (!updated) this.push(n);
        }  
        return this;
    }
};


Array.prototype.by_name = function(attr, val) {
    var rv = Array();
    if (attr && val) {
        for (e of this){
            if ( attr in e && e[attr]==val ) {
                rv.push(e);
            }
        }
    }
    return rv;
};