Exercise Solutions: Booleans and ConditionalsΒΆ

  1. Declare and initialize the following variables for our space shuttle.

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    let engineIndicatorLight = "red blinking";
let spaceSuitsOn = true;
let shuttleCabinReady = true;
let crewStatus = spaceSuitsOn && shuttleCabinReady;
let computerStatusCode = 200;
let shuttleSpeed = 15000;

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  1. Write conditional expressions to satisfy the safety rules.

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

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      if (computerStatusCode === 200) {
   console.log("Please stand by. Computer is rebooting.");
} else if (computerStatusCode === 400) {
   console.log("Success! Computer online.");
} else {
   console.log("ALERT: Computer offline!");
}

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      if (shuttleSpeed > 17500) {
   console.log("ALERT: Escape velocity reached!");
} else if (shuttleSpeed < 8000) {
   console.log("ALERT: Cannot maintain orbit!");
} else {
   console.log("Stable speed.");
}

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  1. Monitor the shuttle's fuel status.

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    if (fuelLevel < 1000 || engineTemperature > 3500 || engineIndicatorLight === "red blinking") {
   console.log("ENGINE FAILURE IMMINENT!");
} else if (fuelLevel <= 5000 || engineTemperature > 2500) {
   console.log("Check fuel level. Engines running hot.");
} else if (fuelLevel > 20000 && engineTemperature <= 2500) {
   console.log("Full tank. Engines good.");
} else if (fuelLevel > 10000 && engineTemperature <= 2500) {
   console.log("Fuel level above 50%. Engines good.");
} else if (fuelLevel > 5000 && engineTemperature <= 2500) {
   console.log("Fuel level above 25%. Engines good.");
} else {
   console.log("Fuel and engine status pending...");
}

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