oneLine-noScroll-Console.js

let myConsole = (function(){
	let the_log_buffer=[[]], the_count=0, the_single_line=false;
	const THE_CONSOLE=console, LINE_DIVIDER='  ~  ', ONE_LINE='ONE_LINE',     
	      PARAMETER_SEPARATOR= ', ', NEW_LINE = Symbol();
		  
	const start = (line_type='NOT_ONE_LINE') => {
		the_log_buffer=[[]];
		the_count=0;
		the_single_line = line_type == ONE_LINE;   
		console = myConsole;  
	}
	const stop = () =>  {
		isNewline();
		console = THE_CONSOLE; 
	};							
	const isNewline = a_param => {
		if (the_single_line && a_param==NEW_LINE) return;
		const buffer_parts = the_log_buffer.map(one_set=> one_set.join(PARAMETER_SEPARATOR))
		const buffer_line = buffer_parts.join(LINE_DIVIDER);	
		if (the_single_line) {                           
		  THE_CONSOLE.clear();
		}
		THE_CONSOLE.log( buffer_line ); 
		the_log_buffer = [[]];
		the_count=0;
	}
	const anObject = an_object => {            
		if (an_object instanceof Error){
			const error_props = [...Object.getOwnPropertyNames(an_object)];
			error_props.map( error_key => an_object['_' + error_key] = an_object[error_key] );
		}
		the_log_buffer[the_count].push(JSON.stringify(an_object));
	}
	const aScalar = a_scalar => {
		if (typeof a_scalar === 'string' && !isNaN(a_scalar)) {
			the_log_buffer[the_count].push("'" + a_scalar + "'");
		} else {
			the_log_buffer[the_count].push(a_scalar);
		}
	}
	const notNewline = a_param => typeof a_param === 'object' ? anObject(a_param) : aScalar(a_param);
	const checkNewline = a_param => a_param == NEW_LINE ? isNewline(a_param) : notNewline(a_param);
	const log = (...parameters_list) => {   
		the_log_buffer[the_count]=[];
		parameters_list.map( checkNewline );
		if (the_single_line){
			isNewline(undefined);
		}else{
			const last_log = parameters_list.pop();
			if (last_log !== NEW_LINE){
				the_count++;
			}
		}
	}
	return Object.assign({}, console, {start, stop, log, ONE_LINE, NEW_LINE});
})();

function showConcatLog(){
	myConsole.stop();
	myConsole.start();
	console.log('a');
	console.log('bb');	
	console.dir({i:'not', j:'affected', k:'but not in step'})
	console.log('ccc');
	console.log([1,2,3,4,5,'6'], {x:8, y:'9'});
	console.log("dddd", 1, '2', 3, myConsole.NEW_LINE);
	console.log("z", myConsole.NEW_LINE, 8, '7');
	console.log(new Error("error test"));
	myConsole.stop();
}

myConsole.start(myConsole.ONE_LINE);
var stop_callback = 5;
function myCallback(){
	console.log(stop_callback, 'Date.now()', myConsole.NEW_LINE, Date.now());
	stop_callback--;
	if (stop_callback>0){
		window.setTimeout(myCallback, 1000);
	}else{
		showConcatLog();
	}
}		
window.setTimeout(myCallback, 1000);