The primitive or special reference types in JS are created to ease up the operations with primitive values, such as the Boolean type, the Number type and the String type.

Traditional methods

All three primitive types contain these traditional methods:

The primitive wrappers traditional methods
METHOD DESCRIPTION
valueOf() Returns the value of the reference type. 
toLocaleString() Returns the string representation of the reference type's value set for the local charset.
toString() Returns the string representation of the reference type's value.

The Boolean type

The Boolean type is the reference type that corresponds to the Boolean value. To create an object, a Boolean constructor is used with TRUE or FALSE values passed in.

var boolObject = new Boolean(true);

The Number type

The Number type is the reference type that corresponds to the numeric values. To create an object, a Number constructor is used with a number value passed in.

var numberObject = new Number(number);

The number type methods
METHOD DESCRIPTION
toFixed() Returns a string represented as a number with a decimal point specified within apprentices.
toExponential() Returns a string represented as a number formatted in exponential notation; Decimal point is also specified within apprentices.
toPrecision() Returns either the fixed or exponential representation of the number depending on which makes more sense; The argument passed represents the number of digits to be used.

The String type

The String type is the reference type that corresponds to the string values. To create an object, a String constructor is used with a string being passed in, as shown below:

var stringObject = new String("Happy new year!");

The String type has a property length that returns the number of characters in a string.

The string type character methods
METHOD DESCRIPTION
charAt() Returns the character at the position given within the apprentices, starting with 0as the first character.
charCodeAt() Returns the character's (at the given position) character code, instead of the character itself.
fromCharCodeAt() Returns a character's code and converts it into a string.

The string type manipulation methods
METHOD DESCRIPTION
concat() Concatenates one or more strings to another, returning the concatenated string as result.
slice() Returns a substring of a given string they are applied on. The second argument is the position before which capture is stopped.
substr() Returns a substring of a given string they are applied on. The second argument is the number of characters to return.
substring() Returns a substring of a given string they are applied on. The second argument is the position before which capture is stopped.

The string type location methods
METHOD DESCRIPTION
indexOf() Searches a given string for a substring and return -1 if it hasn't been found. Starts searching at the beginning of the string.
lastIndexOf() Searches a given string for a substring and return -1 if it hasn't been found. Starts at the end.

The string type compare methods
METHOD DESCRIPTION
localeCompare() Compares one string to another and returns -1, 0, or 1.

The string type case methods
METHOD DESCRIPTION
toLowerCase() Converts case from lower to upper.
toLocaleLowercase() Converts case from lower to upper according to locale rules.
toUpperCase() Converts case from upper to lower.
toLocaleUpperCase() Converts case from upper to lower according to locale rules.

The string type pattern matching methods
METHOD DESCRIPTION
match() Accepts only one argument and it is used to extract groups of matched data
search() Returns the index of the first pattern occurrence in a string.
replace() Replaces the given pattern with a given string.
split() Separates a string into an array substrings based on a passed separator.