let obj = {name:'John Doe'};
let arr =[1,true,null,'john',{},NaN]




/*let engineIndicatorLights = 'red blinking';
let spaceSuitsOn = true;
let shuttleCabinReady = true;
let crewStatus = spaceSuitsOn && shuttleCabinReady;
let computerStatusCode = 200;
let shuttleSpeed = 15_000;
let fuelLevel= 5_00;
let engineTemperature= 5_00;

if (crewStatus) {
	console.log('Crew Ready');
}
else {
	console.log('Crew Not Ready');
}

if (computerStatusCode === 200) {
	console.log('Pleas stand by, computer is rebooting!');
}
	else if(computerStatusCode === 400) {
		console.log('Success. Computer Online');
	} else {
	console.log('ALERT: Computer offline');
	}

	if(shuttleSpeed > 17_500) {
		console.log("ALERT: Escape velocity reached!");
	}
		else if (shuttleSpeed < 8_000) {
			console.log("ALERT: Cannot maintain orbit!");
		}
		else {
			console.log("stable speed");
		}


	if(fuelLevel > 20_000 && engineTemperature <= 2_500){
			console.log("Full tank. Engines good");
		}
		else if(fuelLevel > 10_000 && engineTemperature <= 2_500){
			console.log("Full level above 50%. Engines good.");
		}
		else if(fuelLevel > 5_000 && engineTemperature <= 2_500){
			console.log("Full level above 25%. Engines good.");
		}
		else if(fuelLevel<=5_000 || engineTemperature > 2_500){
			console.log('Check fuel level. Engines running hot');
		}
		else if (fuelLevel < 1_000 || engineTemperature > 3_500 || engineIndicatorLights === 'red blinking'){
			console.log('ENGINE FAILURE EMINENT');
		}
		else {
			console.log('Fuel and engine status penging...');
		}


	*/