isFinite() - Checks whether a value is a finite number. Finite is a number that isn't infinite and can be measured or given a value.
It only takes a single parameter which is the value you'd like to check. It's return value will be a boolean (true or false)
Numbers that pass as finite: 0 whole numbers negative numbers decimals equations
isInteger() - Checks whether the value passed is an integer. It's return value will be a boolean (true / false)
isNaN - Checks whether the value passed is NaN (Not a number) or if the value is a number
true = NaN
isSafeInteger() - Checks whether the method passed is a safe integer. The returned value will provide a boolean.
A safe integer is represented as an IEEE-754 double precision number. This is simply any number between -9007199254740991 and 9007199254740991.
Note that the value isn't changed to a number if a string is passed in.
toExponential() - Converts a number to its exponential form. The returned value is a string that represents the Number object in exponential notation
toFixed() - Formats a number using the fixed-point notation. It allows you to format a number with a specific number of digits to the right of the decimal. Numbers will be rounded is ncessary.
Its return value is a string with the given number using fixed-point notation. If the number given is negative, the return value will be a number and won't be converted into a string.
toLocaleString() - Converts a number into a language-sensitive representation of said number. It can take in two optional parameters:
- locales: A string with a language tag (bali, latn)
- options: A set of options for the given locale (curency, style)
The return value is a string.
toPrecision() - Converts a number to the specified precision.
The returned value is in the form of a string. The value will be rounded and padded with 0's if there are not enough digits.
toString() - Converts a given number to a string with the specified base number (an integer betwen 2 and 36)
The return value is given in the form of a string if no radix is given.
*valueOf() - Returns the number value in primitive form of a Number object. This is rarely something done on your own, as JavaScript invokes this automatically.