intercept console.log method

intercept_console_log.js

/**
 * This function extends console.log functionality with given logger.
 * @param {function} logger - Custom logger
 */
function extendLog(logger) {
    var original = console.log;
    console.log = function() {
        logger(Array.prototype.slice.call(arguments));
        return original.apply(this, arguments);
    }
}

/**
 * Custom logger used to extend console.log
 * @param {Object[]} args - array of arguments passed to original console.log
 */
var myLogger = function(args) {
    var log = document.createElement("div");
    log.innerHTML = args;
    document.body.appendChild(log);
}

extendLog(myLogger);

console.log("Hello world!");
console.log("How", "are", "you?");