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The value of mood is a string literal, whereas the value of age is a number literal. These are two different types of data, but JavaScript makes no distinction in how they are declared or assigned. Some other languages demand that when a variable is declared, its data type is also declared. This is called typing. Programming languages that require explicit typing are called strongly typed languages. Because typing is not required in JavaScript, it is a weakly typed language. This means that you can change the data type of a variable at any stage. The following statements would be illegal in a strongly typed language but are perfectly fine in JavaScript:
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var age = "thirty three"; age = 33; JavaScript doesn t care whether age is a string or a number. Now let s review the most important data types that exist within JavaScript.
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Strings
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Strings consist of zero or more characters. Characters include letters, numbers, punctuation marks, and spaces. Strings must be enclosed in quotes. You can use either single quotes or double quotes. Both of these statements have the same result: var mood = 'happy'; var mood = "happy"; Use whichever one you like, but it s worth thinking about what characters are going to be contained in your string. If your string contains the double-quote character, then it makes sense to use single quotes to enclose the string. If the single-quote character is part of the string, you should probably use double quotes to enclose the string: var mood = "don't ask"; If you wanted to write that statement with single quotes, you would need to ensure that the apostrophe (or single quote) between the n and the t is treated as part of the string. In this case, the single quote needs to be treated the same as any other character, rather than as a signal for marking the end of the string. This is called escaping. In JavaScript, escaping is done using the backslash character: var mood = 'don\'t ask'; Similarly, if you enclose a string with double quotes, but that string also contains a double-quote character, you can use the backslash to escape the double-quote character within the string: var height = "about 5'10\" tall"; These backslashes don t actually form part of the string. You can test this for yourself by adding the following to your example.js file and reloading test.html: var height = "about 5'10\" tall"; alert(height); Here s an example of the output of a variable using backslashes to escape characters:
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Personally, I like to use double quotes. Whether you decide to use double or single quotes, it s best to be consistent. If you switch between using double and single quotes all the time, your code could quickly become hard to read.
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Numbers
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If you want a variable to contain a numeric value, you don t have to limit yourself to whole numbers. JavaScript also allows you to specify numbers to as many decimal places as you want. These are called floating-point numbers: var age = 33.25; You can also use negative numbers. A minus sign at the beginning of a number indicates that it s negative: var temperature = -20; Negative values aren t limited to whole numbers either: var temperature = -20.33333333 These are all examples of the number data type.
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Boolean values
Another data type is Boolean. Boolean data has just two possible values: true or false. Let s say you wanted a variable to store one value for when you re sleeping and another value for when you re no. You could use the string data type and assign it values like sleeping or not sleeping, but it makes much more sense to use the Boolean data type: var sleeping = true; Boolean values lie at the heart of all computer programming. At a fundamental level, all electrical circuits use only Boolean data: either the current is flowing or it isn t. Whether you think of it in terms of true and false, yes and no, or one and zero, the important thing is that there can only ever be one of two values. Boolean values, unlike string values, are not enclosed in quotes. There is a difference between the Boolean value false and false as a string. This will set the variable married to the Boolean value true: var married = true; In this case, married is a string containing the word true : var married = "true";
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