Created
September 9, 2017 00:03
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Logic Drills
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function main() { | |
try { | |
doAllTheThings(); | |
} | |
catch(e) { | |
console.error(e); | |
reportError(e); | |
} | |
} | |
function doAllTheThings() { | |
throw { | |
message: "Everything's ruined", | |
name: "FatalException", | |
toString: function() { | |
return `${this.name}: ${this.message}`; | |
} | |
} | |
} | |
function reportError(e) { | |
$('.js-error-report').text(`Uh oh, something went wrong! Here's what we know: ${e.message}`); | |
} | |
/* From here down, you are not expected to | |
understand.... for now :) | |
Nothing to see here! | |
*/ | |
$(main); |
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function doTrafficLights() { | |
const activeLight = getActiveLight(); | |
if (activeLight === 'red') { | |
turnRed(); | |
} | |
else if (activeLight === 'yellow') { | |
turnYellow(); | |
} | |
else if (activeLight === 'green') { | |
turnGreen(); | |
} | |
} | |
// this function randomly returns red, yellow, or green | |
// and is called by doTrafficLights. | |
// don't modify it! | |
function getActiveLight() { | |
return (['red', 'green', 'yellow'])[Math.floor(Math.random() * 3)]; | |
} | |
/* From here down, you are not expected to | |
understand.... for now :) | |
Nothing to see here! | |
*/ | |
function turnOffLights() { | |
$('.traffic-light').removeClass('yellow-on red-on green-on'); | |
} | |
function turnGreen() { | |
turnOffLights(); | |
$('.green-light').addClass('green-on'); | |
} | |
function turnYellow() { | |
turnOffLights(); | |
$('.yellow-light').addClass('yellow-on'); | |
} | |
function turnRed() { | |
turnOffLights(); | |
$('.red-light').addClass('red-on'); | |
} | |
function handleClicks() { | |
$('.js-control-lights').click(function() { | |
doTrafficLights(); | |
}); | |
} | |
$(function() { | |
turnOffLights(); | |
handleClicks(); | |
}); |
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