js_review.md

JavaScript Review

What is the difference between == and ===? Why is it necessary to have both of these?

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Rewrite the following code using the ternary operator:

var isColdOutside = true;

var clothingToWear;

if (isColdOutside) {
    clothingToWear = 'sweater and a jacket';
} else {
    clothingToWear = 'shorts and a t-shirt';
}

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Rewrite the following using a for loop:

var i = 0;
while (i <= 10) {
    console.log(i);
    i++;
}

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To skip to the next iteration of a loop you would use which statement?

• break;
• continue;

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Rewrite the following using a switch statement:

// assume getWeatherConditions will return one of 'rain', 'snow', 'clear'
var conditions = getWeatherConditions();

if (conditions == 'rain') {
    console.log('bring an umbrella!');
} else if (conditions == 'snow') {
    console.log('What!? In San Antonio?');
} else if (conditions == 'clear') {
    console.log('It\'s a nice day!');
}

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What is the difference between inline and external JavaScript? Why would you use one over the other?

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What does the following code output?

console.log(10 % 3);

• 3
• 3.3333333
• 0
• 1

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Do the following evaluate to true or false?

• "" == false
• 0 === false
• "42" != 42
• `"42" !== 42``

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The following expressions are shorthand, write out the longhand version.

• i++
• x -= 5
• x /= 3
• myString += ', and thanks for all the fish';