/**
 * @summary Function that wait for var be ready, and when its ready it will run the callback
 * @description Function will be reexecuted on setTimeOut until var is ready
 * when var exists the `callback` will be executed
 * the function usually runs by passing an global param as `variable`
 *
 * @param { Function } fnIsTrue - The function that should return an boolean
 * @param { Function } callback - The callback function to be executed
 */
function waitForTrue (fnIsTrue, callback) {
    if (fnIsTrue()) {
        callback();
    } else {
        setTimeout(function() {
            waitForTrue(fnIsTrue, callback);
        }, 50);
    }
}