A JavaScript method is a property containing a function definition. In other words, when the data stored on an object is a function we call that a method.
Number Methods
| Method | Description |
|---|---|
| constructor() | Returns the function that created this object’s instance. By default this is the Number object. |
| toExponential() | Forces a number to display in exponential notation, even if the number is in the range in which JavaScript normally uses standard notation. |
| toFixed() | Formats a number with a specific number of digits to the right of the decimal. |
| toLocaleString() | Returns a string value version of the current number in a formatb that may vary according to a browser’s locale settings. |
| toPrecision() | Defines how many total digits (including digits to the left and right of the decimal) to display of a number. |
| toString() | Returns the string representation of the number’s value. |
| valueOf() | Returns the number’s value. |
Boolean Methods
| Method | Description |
|---|---|
| toSource() | Returns a string containing the source of the Boolean object; you can use this string to create an equivalent object. |
| toString() | Returns a string of either “true” or “false” depending upon the value of the object. |
| valueOf() | Returns the primitive value of the Boolean object. |
String Methods
| Method | Description |
|---|---|
| charAt() | Returns the character at the specified index. |
| charCodeAt() | Returns a number indicating the Unicode value of the character at the given index. |
| concat() | Combines the text of two strings and returns a new string. |
| indexOf() | Returns the index within the calling String object of the first occurrence of the specified value, or -1 if not found. |
| lastIndexOf() | Returns the index within the calling String object of the last occurrence of the specified value, or -1 if not found. |
| localeCompare() | Returns a number indicating whether a reference string comes before or after or is the same as the given string in sort order. |
| length() | Returns the length of the string. |
| match() | Used to match a regular expression against a string. |
| replace() | Used to find a match between a regular expression and a string, and to replace the matched substring with a new substring. |
| search() | Executes the search for a match between a regular expression and a specified string. |
| slice() | Extracts a section of a string and returns a new string. |
| split() | Splits a String object into an array of strings by separating the string into substrings. |
| substr() | Returns the characters in a string beginning at the specified location through the specified number of characters. |
| substring() | Returns the characters in a string between two indexes into the string. |
| toLocaleLowerCase() | The characters within a string are converted to lower case while respecting the current locale. |
| toLocaleUpperCase() | The characters within a string are converted to upper case while respecting the current locale. |
| toLowerCase() | Returns the calling string value converted to lower case. |
| toString() | Returns a string representing the specified object. |
| toUpperCase() | Returns the calling string value converted to uppercase. |
| valueOf() | Returns the primitive value of the specified object. |
String HTML wrappers
| Method | Description |
|---|---|
| anchor() | Creates an HTML anchor that is used as a hypertext target. |
| big() | Creates a string to be displayed in a big font as if it were in a <big> tag. |
| blink() | Creates a string to blink as if it were in a <blink> tag. |
| bold() | Creates a string to be displayed as bold as if it were in a <b> tag. |
| fixed() | Causes a string to be displayed in fixed-pitch font as if it were in a <tt> tag |
| fontcolor() | Causes a string to be displayed in the specified color as if it were in a <font color=”color”> tag. |
| fontsize() | Causes a string to be displayed in the specified font size as if it were in a <font size=”size”> tag. |
| italics() | Causes a string to be italic, as if it were in an <i> tag. |
| link() | Creates an HTML hypertext link that requests another URL. |
| small() | Causes a string to be displayed in a small font, as if it were in a <small> tag. |
| strike() | Causes a string to be displayed as struck-out text, as if it were in a <strike> tag. |
| sub() | Causes a string to be displayed as a subscript, as if it were in a <sub> tag |
| sup() | Causes a string to be displayed as a superscript, as if it were in a <sup> tag |
Array Methods
| Method | Description |
|---|---|
| concat() | Returns a new array comprised of this array joined with other array(s) and/or value(s). |
| every() | Returns true if every element in this array satisfies the provided testing function. |
| filter() | Creates a new array with all of the elements of this array for which the provided filtering function returns true. |
| forEach() | Calls a function for each element in the array. |
| indexOf() | Returns the first (least) index of an element within the array equal to the specified value, or -1 if none is found. |
| join() | Joins all elements of an array into a string. |
| lastIndexOf() | Returns the last (greatest) index of an element within the array equal to the specified value, or -1 if none is found. |
| map() | Creates a new array with the results of calling a provided function on every element in this array. |
| pop() | Removes the last element from an array and returns that element. |
| push() | Adds one or more elements to the end of an array and returns the new length of the array. |
| reduce() | Apply a function simultaneously against two values of the array (from left-to-right) as to reduce it to a single value. |
| reduceRight() | Apply a function simultaneously against two values of the array (from right-to-left) as to reduce it to a single value. |
| reverse() | Reverses the order of the elements of an array — the first becomes the last, and the last becomes the first. |
| shift() | Removes the first element from an array and returns that element. |
| slice() | Extracts a section of an array and returns a new array. |
| some() | Returns true if at least one element in this array satisfies the provided testing function. |
| toSource() | Represents the source code of an object |
| sort() | Sorts the elements of an array. |
| splice() | Adds and/or removes elements from an array. |
| toString() | Returns a string representing the array and its elements. |
| unshift() | Adds one or more elements to the front of an array and returns the new length of the array. |
Date Methods
| Method | Description |
|---|---|
| Date() | Returns today’s date and time |
| getDate() | Returns the day of the month for the specified date according to local time. |
| getDay() | Returns the day of the week for the specified date according to local time. |
| getFullYear() | Returns the year of the specified date according to local time. |
| getHours() | Returns the hour in the specified date according to local time. |
| getMilliseconds() | Returns the milliseconds in the specified date according to local time. |
| getMinutes() | Returns the minutes in the specified date according to local time. |
| getMonth() | Returns the month in the specified date according to local time. |
| getSeconds() | Returns the seconds in the specified date according to local time. |
| getTime() | Returns the numeric value of the specified date as the number of milliseconds since January 1, 1970, 00:00:00 UTC. |
| getTimezoneOffset() | Returns the time-zone offset in minutes for the current locale. |
| getUTCDate() | Returns the day (date) of the month in the specified date according to universal time. |
| getUTCDay() | Returns the day of the week in the specified date according to universal time. |
| getUTCFullYear() | Returns the year in the specified date according to universal time. |
| getUTCHours() | Returns the hours in the specified date according to universal time. |
| getUTCMilliseconds() | Returns the milliseconds in the specified date according to universal time. |
| getUTCMinutes() | Returns the minutes in the specified date according to universal time. |
| getUTCMonth() | Returns the month in the specified date according to universal time. |
| getUTCSeconds() | Returns the seconds in the specified date according to universal time. |
| getYear() | Deprecated – Returns the year in the specified date according to local time. Use getFullYear instead. |
| setDate() | Sets the day of the month for a specified date according to local time. |
| setFullYear() | Sets the full year for a specified date according to local time. |
| setHours() | Sets the hours for a specified date according to local time. |
| setMilliseconds() | Sets the milliseconds for a specified date according to local time. |
| setMinutes() | Sets the minutes for a specified date according to local time. |
| setMonth() | Sets the month for a specified date according to local time. |
| setSeconds() | Sets the seconds for a specified date according to local time. |
| setTime() | Sets the Date object to the time represented by a number of milliseconds since January 1, 1970, 00:00:00 UTC. |
| setUTCDate() | Sets the day of the month for a specified date according to universal time. |
| setUTCFullYear() | Sets the full year for a specified date according to universal time. |
| setUTCHours() | Sets the hour for a specified date according to universal time. |
| setUTCMilliseconds() | Sets the milliseconds for a specified date according to universal time. |
| setUTCMinutes() | Sets the minutes for a specified date according to universal time. |
| setUTCMonth() | Sets the month for a specified date according to universal time. |
| setUTCSeconds() | Sets the seconds for a specified date according to universal time. |
| setYear() | Deprecated – Sets the year for a specified date according to local time. Use setFullYear instead. |
| toDateString() | Returns the “date” portion of the Date as a human-readable string. |
| toGMTString() | Deprecated – Converts a date to a string, using the Internet GMT conventions. Use toUTCString instead. |
| toLocaleDateString() | Returns the “date” portion of the Date as a string, using the current locale’s conventions. |
| toLocaleFormat() | Converts a date to a string, using a format string. |
| toLocaleString() | Converts a date to a string, using the current locale’s conventions. |
| toLocaleTimeString() | Returns the “time” portion of the Date as a string, using the current locale’s conventions. |
| toSource() | Returns a string representing the source for an equivalent Date object; you can use this value to create a new object. |
| toString() | Returns a string representing the specified Date object. |
| toTimeString() | Returns the “time” portion of the Date as a human-readable string. |
| toUTCString() | Converts a date to a string, using the universal time convention. |
| valueOf() | Returns the primitive value of a Date object. |
Date Static Methods
| Method | Description |
|---|---|
| Date.parse( ) | Parses a string representation of a date and time and returns the internal millisecond representation of that date. |
| Date.UTC( ) | Returns the millisecond representation of the specified UTC date and time. |
Math Methods
| Method | Description |
|---|---|
| abs() | Returns the absolute value of a number. |
| acos() | Returns the arccosine (in radians) of a number. |
| asin() | Returns the arcsine (in radians) of a number. |
| atan() | Returns the arctangent (in radians) of a number. |
| atan2() | Returns the arctangent of the quotient of its arguments. |
| ceil() | Returns the smallest integer greater than or equal to a number. |
| cos() | Returns the cosine of a number. |
| exp() | Returns EN, where N is the argument, and E is Euler’s constant, the base of the natural logarithm. |
| floor() | Returns the largest integer less than or equal to a number. |
| log() | Returns the natural logarithm (base E) of a number. |
| max() | Returns the largest of zero or more numbers. |
| min() | Returns the smallest of zero or more numbers. |
| pow() | Returns base to the exponent power, that is, base exponent. |
| random() | Returns a pseudo-random number between 0 and 1. |
| round() | Returns the value of a number rounded to the nearest integer. |
| sin() | Returns the sine of a number. |
| sqrt() | Returns the square root of a number. |
| tan() | Returns the tangent of a number. |
| toSource() | Returns the string “Math”. |
RegExp Methods
Here is a list of each method and its description.
| Method | Description |
|---|---|
| exec() | Executes a search for a match in its string parameter. |
| test() | Tests for a match in its string parameter. |
| toSource() | Returns an object literal representing the specified object; you can use this value to create a new object. |
| toString() | Returns a string representing the specified object. |
