Simple logging utility for JS, takes IE's lack of console into account as well as difference in browser abilities with regard to console.info, console.warn and console.error.

simple_logging.js

    app = {
        DEBUG: true,
        VERSION: '1.0.0'
    };
    
    app.logs = app.logs || { info: [], error: [], warn: [] };
    app.logger = app.logger || {
        log: function () {
            var type = arguments[0],
                msg = arguments[1],
                nop = typeof console === 'undefined';

            msg = msg ? msg : type;
            type = ['info', 'warn', 'error'].indexOf(type) < 0 ? 'info' : type;

            app.logs[type].push(msg);

            if (!nop && ((!app.DEBUG && type === 'error') || app.DEBUG)) {
                var func = console[type] || console.log;
                return func.apply(console, [msg]);
            }
        }
    };
    
    
    // USE:
    // >>> app.logger.log('info', 'My info message');
    // >>> app.logs.info
    // ['My info message']