If you were looking for a handy JavaScript cheatsheet for all the string methods, including their parameters, descriptions, and examples, you've found it.
Note you can use the table of contents above or CMD + F to quickly find what you're looking for.
charAt()
Parameters: index (optional)
Description: Returns the character at the specified index in a string.
Example:
let str = "Hello";
console.log(str.charAt(1)); // Output: "e"
charCodeAt()
Parameters: index (optional)
Description: Returns the Unicode of the character at the specified index in a string.
Example:
let str = "Hello";
console.log(str.charCodeAt(1)); // Output: 101
concat()
Parameters: string2, string3, ..., stringX
Description: Joins two or more strings.
Example:
let str1 = "Hello";
let str2 = "World";
console.log(str1.concat(" ", str2)); // Output: "Hello World"
endsWith()
Parameters: searchvalue, length (optional)
Description: Checks whether a string ends with specified characters.
Example:
let str = "Hello World";
console.log(str.endsWith("World")); // Output: true
includes()
Parameters: searchvalue, start (optional)
Description: Checks whether a string contains the specified string/characters.
Example:
let str = "Hello World";
console.log(str.includes("World")); // Output: true
indexOf()
Parameters: searchvalue, start (optional)
Description: Returns the position of the first occurrence of a specified value in a string.
Example:
let str = "Hello World";
console.log(str.indexOf("o")); // Output: 4
lastIndexOf()
Parameters: searchvalue, start (optional)
Description: Returns the position of the last occurrence of a specified value in a string.
Example:
let str = "Hello World";
console.log(str.lastIndexOf("o")); // Output: 7
match()
Parameters: regexp
Description: Searches a string for a match against a regular expression, and returns the matches.
Example:
let str = "The rain in SPAIN stays mainly in the plain";
console.log(str.match(/ain/gi)); // Output: ["ain", "AIN", "ain", "ain"]
padEnd()
Parameters: targetLength, padString (optional)
Description: Pads the current string with a given string (repeated, if needed) so that the resulting string reaches a given length.
Example:
let str = "5";
console.log(str.padEnd(4, "0")); // Output: "5000"
padStart()
Parameters: targetLength, padString (optional)
Description: Pads the current string with another string (multiple times, if needed) until the resulting string reaches the given length.
Example:
let str = "5";
console.log(str.padStart(4, "0")); // Output: "0005"
repeat()
Parameters: count
Description: Returns a new string with a specified number of copies of the string it was called on.
Example:
let str = "Hello";
console.log(str.repeat(3)); // Output: "HelloHelloHello"
replace()
Parameters: searchFor, replaceWith
Description: Searches a string for a specified value, or a regular expression, and returns a new string where the specified values are replaced.
Example:
let str = "Hello World";
console.log(str.replace("World", "Universe")); // Output: "Hello Universe"
replaceAll()
Parameters: searchFor, replaceWith
Description: Returns a new string with all matches of a pattern replaced by a replacement.
Example:
let str = "cat cat cat";
console.log(str.replaceAll("cat", "dog")); // Output: "dog dog dog"
search()
Parameters: regexp
Description: Searches a string for a specified value, or regular expression, and returns the position of the match.
Example:
let str = "Hello World";
console.log(str.search("World")); // Output: 6
slice()
Parameters: start, end (optional)
Description: Extracts a part of a string and returns a new string.
Example:
let str = "Hello World";
console.log(str.slice(6)); // Output: "World"
split()
Parameters: separator, limit (optional)
Description: Splits a string into an array of substrings.
Example:
let str = "How are you doing today?";
console.log(str.split(" ")); // Output: ["How", "are", "you", "doing", "today?"]
startsWith()
Parameters: searchvalue, start (optional)
Description: Checks whether a string begins with specified characters.
Example:
let str = "Hello World";
console.log(str.startsWith("Hello")); // Output: true
substring()
Parameters: start, end (optional)
Description: Extracts the characters from a string, between two specified indices.
Example:
let str = "Hello World";
console.log(str.substring(6, 11)); // Output: "World"
toLowerCase()
Parameters: None
Description: Converts a string to lowercase letters.
Example:
let str = "Hello World";
console.log(str.toLowerCase()); // Output: "hello world"
toUpperCase()
Parameters: None
Description: Converts a string to uppercase letters.
Example:
let str = "Hello World";
console.log(str.toUpperCase()); // Output: "HELLO WORLD"
trim()
Parameters: None
Description: Removes whitespace from both sides of a string.
Example:
let str = " Hello World ";
console.log(str.trim()); // Output: "Hello World"
trimStart()
Parameters: None
Description: Removes whitespace from the beginning of a string.
Example:
let str = " Hello World ";
console.log(str.trimStart()); // Output: "Hello World "
trimEnd()
Parameters: None
Description: Removes whitespace from the end of a string.
Example:
let str = " Hello World ";
console.log(str.trimEnd()); // Output: " Hello World"
Final words
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