Closer

loader.js

var loader = (function() {
    var speed = 200,
        index = 0,
        timeout = null,
        symbols = ['└', '├', '┌', '┬', '┐', '┤', '┘', '┴'];
        
    function show() {
        console.log(symbols[index]);
        index = (index + 1) % symbols.length;
        timeout = setTimeout(show, speed);
    }
    
    function hide() {
        clearTimeout(timeout);
    }
        
    return { show: show, hide: hide };
})();

// Testing
loader.show();
setTimeout(function() { loader.hide(); }, 5000);