To convert a number to a string, you can either use the
parseFloat() method, depending on whether you want to truncate the decimal point.
parseInt('22') // 22 parseFloat('3.14'); // 3.14 parseFloat('23.4 hahahahahlololol'); // 23.4
In the last example, only the first number in the string is parsed. If there are no values at the beginning, you'll get a
NaN data type.
These methods can be used with any number value.
var sampleNum = 5; sampleNum.toPrecision(4); // 4.000 sampleNum.MAX_VALUE; // 1.7976931348623157e+308
The Math object contains a library of parameters and functions related to number generation and manipulation. To call it, call the Math variable, and either its attributes or a function.
Here are some common constants that are stored as attributes in the Math object:
Furthermore, the Math object contains a number of functions for complex calculations.
Math.min(1, 4, 5); // 1 Math.floor(1.242); // 1 Math.isNaN(21); // false
We'll soon cover objects, but for now just use this notation to access Math's attributes and functions.
To generate random numbers, use the
Math.random() function. This will return a value from 0 up to 1.
Thus we can get a random number between 1 and 100 with the following code:
var randomNum; randomNum = Math.floor((Math.random() * 100) + 1);
The dot notation is called so because it uses the period (or the dot) to access an object's methods and properties. As you will (or have) seen in many other programming languages, the dot notation provides a clean way to access the members of an object.
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