如何在node.js中的布尔变量中更改消息

Question

I'm trying to modify a code so when a LED turn on and off, the program will show an Active-Inactive message, instead of a classic boolean True-false.

I'm currently using this code in a Beaglebone Black, I'm new in Node.js, and I found it in a book (Exploring BeagleBone), when I ran it like it was in the book it worked showing a message of: Led is: true, Led is: false , but when I tried to modify it to show active-inactive, it didn't work.

function toggleLED()
{
    isOn = !isOn    // invert the isOn state in each call
    if (isOn) b.digitalWrite(LED3Pin, 1); // light the led
    else b.digitalWrite(LED3Pin, 0); // turn off the led
    if (isOn) isOn = 'active'; // changing default TRUE message for active
    else isOn = 'inactive'; // changing default FALSE message for inactive
    console.log('LED is: ' + isOn); // show the state
}

I expect the output of this code as: LED is: active, LED is: inactive, LED is: active, LED is: inactive , and so on, but the actual output just shows the first as active and the rest as inactive .

Answer 1

function toggleLED()
{
    isOn = !isOn    // invert the isOn state in each call
    if (isOn) b.digitalWrite(LED3Pin, 1); // light the led
    else b.digitalWrite(LED3Pin, 0); // turn off the led
    console.log('LED is: ' + isOn ? 'active' : 'inactive'); // show the state
}

You changed variable isOn from boolean value true or false to string "active" or "inactive" , which would be considered as true the next call. That's why the rest will all be inactive .