javascript-string tagged requests and articles
Categorized request examples and articles tagged with [javascript-string] keyword How do I convert array to string in JavaScript?
To convert an array to a string in JavaScript, you can use the Array.toString() method. This method returns a string where all array elements are concatenated into a comma-separated string. The Array.toString() method does not change the original array. Calling this method on an empty array results in an empty string. Any array elements that are null or undefined will be converted to an empty string. The Array.toString() method does not accept any parameters. If you need to convert an array to a string with a specific separator, use the Array.join(separator) method. In this JavaScript Array to String example, we use the Array.toString() method to convert an array with elements to a string. More examples of converting an array to a string are listed below. Click "Run" to run the JavaScript toString example online and see the result.
How do I get a substring from a string in JavaScript?
To get a substring from a string in JavaScript, you can use the built-in string.substring(start, end) method. The first parameter specifies the index of the first character from which to get the substring (in JavaScript, indexing starts from zero). The second optional parameter specifies the index of the first character to exclude from the returned substring. If the second parameter is not specified, then the substring() method copies all characters up to the end of the string. The substring() function does not alter the original string but returns the substring from the given string. You can also get a substring from a string using the string.substr(start, length) method, which takes the number of characters to extract as its second argument. There is also a string.slice(start, end) method, which is almost identical to string.substring(), but differs in the way it handles negative argument values. In this JavaScript Substring example, we use the string.substring(start, end) method to return a substring from a string. Click Execute to run the JavaScript Substring Example online and see the result.
How do I check if a string contains a substring in JavaScript?
To check if a string contains a substring in JavaScript, use the string.includes(term, start) method, which checks if the string contains the substring. The first parameter is the string to search for, and the second optional parameter specifies the position from which to search. The string.includes() method is case-sensitive. Also, you can check if the string contains a substring by using a string.indexOf(term, start), which returns the index of the substring within the string instead of the boolean value returned by the string.includes(). In this JavaScript String Contains Substring example, we use the string.includes() to check if the substring is in the string. You can see more examples of searching for substrings in strings below, including using JavaScript Regular Expressions. Click Execute to run the JavaScript String Contains Substring Example online and see the result.
How do I split a string in JavaScript?
To split a string in JavaScript, you can use the string.split(separator, limit) method. The split() method splits the given string into an array of strings using "separator" as the delimiter. The second parameter determines how many times to split the string. The string.split() method returns a new array without changing the original string. In addition to the string.split() method, you can split a string using Regular Expressions (see example below). In this Split a String in JavaScript example, we are splitting a string using the split() method. An example of splitting a string using Regular Expressions in JavaScript is shown below. Click Execute to run the JavaScript Split String Example online and see the result.
How do I convert string to array in JavaScript?
To convert a string into an array in JavaScript, you can use the string.split(separator, limit), array.from(string) methods and the spread ("...") operator. The most commonly used method is the string.split(). It converts a string into an array of strings by splitting it with a "separator". The "separator" can be a character, a string, or a regular expression. The optional "limit" parameter specifies how many times to split the string. The array.from() method and the spread ("...") operator convert a string into an array of characters. In this JavaScript String to Array conversion example, we use the string.split() method to convert a string into an array of strings. Below you can see more examples of converting strings to arrays in JavaScript, including Regular Expressions. Click Execute to run the JavaScript String to Array Example online and see the result.
How do I create a multiline string in JavaScript?
To create a multiline JavaScript string, you can enclose the string in template literals `. These multiline strings may contain newlines (\n), tab characters (\t), and other special characters. In addition to creating multiline strings, template string literals provide other useful features, such as string interpolation. Alternatively, you can build a multi-line string using the concatenation (+) operator. Template string literals make code more readable and eliminate the need for string concatenation or character escapes. In this JavaScript example, we use template string literals to create a multi-line string containing HTML tags, tabs, and line breaks. Click Execute to run the JavaScript Multiline String example online and see the result. More JavaScript multiline string examples are provided below.
How do I reverse a string in JavaScript?
JavaScript does not have a built-in method for reversing a string. To reverse a string in JavaScript, you can use a combination of three built-in methods: split(), reverse(), and join(). The first method splits a string into an array of characters and returns a new array. The second method reverses the order of elements in an array (the first element becomes last, and the element becomes first). The third method is used to concatenate all elements of an array into a new string. Another way to reverse a string in JavaScript is to use a combination of the substr() and charAt() methods. The first method returns a substring of the string, and the second method returns the specified character of the string. You can also reverse a string with a for loop, using a decrement (or increment) loop to loop through per character of the string and create a new reversed string. In this JavaScript Reverse String example, we reverse a string using the split(), reverse(), and join() methods. Click "Run" to run the JavaScript string reversal example online and see the result.
How do I concatenate strings in JavaScript?
To concatenate strings in JavaScript, you can use the "+" operator or the string.concat(str1, str2, ...) method. The "+" operator creates a new string by concatenating strings to the left and right of the operator. The string.concat() method takes one or more strings and concatenates them into a new string. The string.concat() method does not modify the provided strings but creates and returns a new string resulting from the concatenation. In this JavaScript String Concatenate example, we use the string.concat() method to concatenate strings. More examples of string concatenation are given below. Click Execute to run the JavaScript String Concatenation Example online and see the result.
How do I get the length of a string in JavaScript?
To get the length of a string in JavaScript, you can to use the string.length property. The length property specifies how many characters the string contains (the length of an empty string is 0). When determining the length of a string, keep in mind that spaces and various characters are also part of the string; each one is a separate character. While the length property is commonly used with other methods in JavaScript, it's important to remember that length itself is not a method and is not calculated every time (so it's fast). In this example, we get the length of a JavaScript string using the length property. Click Execute to run the JavaScript String Length Example online and see the result.
How to trim a string using JavaScript?
To remove spaces from a string using JavaScript, you can use the string.trim() method. The trim() method removes spaces from both ends of a given string without changing the original string. The characters to be removed include space, tab, page, and line terminators (' ', \t, \r, \n, etc). The method returns a new string without any leading or trailing whitespace. To remove spaces within a string, you can use the string.replace() method. Like the string.trim() method, the string.replace() method does not change the original string but returns a copy of the string with all occurrences of the searched value replaced with the new value (see example below). In this JavaScript Trim whitespace from the string example, we remove spaces using the string.trim() method. Click Execute to run the JavaScript Trim String online and see the result
How to check if JavaScript string starts with a string using startsWith method?
To check if a string starts with another string in JavaScript, you can use the string.startsWith(searchString, index) method. The string.startsWith() method determines if the start of this string matches the specified string or character. The first parameter specifies the search string. The second parameter is optional and specifies the index in the given string from which to search. The default value is zero. The string.startsWith() method returns a boolean value - "true" if the given string starts with the specified string, "false" otherwise. You can also determine if a string ends with a specified string by calling the string.endsWith() method. The methods are case-sensitive. In this JavaScript String startsWith example, we check if a string starts with a given string using the startWith() method with the default "index" parameter. Click Execute to run the JavaScript String startsWith Example online and see the result.
To convert an array to a string in JavaScript, you can use the Array.toString() method. This method returns a string where all array elements are concatenated into a comma-separated string. The Array.toString() method does not change the original array. Calling this method on an empty array results in an empty string. Any array elements that are null or undefined will be converted to an empty string. The Array.toString() method does not accept any parameters. If you need to convert an array to a string with a specific separator, use the Array.join(separator) method. In this JavaScript Array to String example, we use the Array.toString() method to convert an array with elements to a string. More examples of converting an array to a string are listed below. Click "Run" to run the JavaScript toString example online and see the result.
How do I get a substring from a string in JavaScript?
To get a substring from a string in JavaScript, you can use the built-in string.substring(start, end) method. The first parameter specifies the index of the first character from which to get the substring (in JavaScript, indexing starts from zero). The second optional parameter specifies the index of the first character to exclude from the returned substring. If the second parameter is not specified, then the substring() method copies all characters up to the end of the string. The substring() function does not alter the original string but returns the substring from the given string. You can also get a substring from a string using the string.substr(start, length) method, which takes the number of characters to extract as its second argument. There is also a string.slice(start, end) method, which is almost identical to string.substring(), but differs in the way it handles negative argument values. In this JavaScript Substring example, we use the string.substring(start, end) method to return a substring from a string. Click Execute to run the JavaScript Substring Example online and see the result.
How do I check if a string contains a substring in JavaScript?
To check if a string contains a substring in JavaScript, use the string.includes(term, start) method, which checks if the string contains the substring. The first parameter is the string to search for, and the second optional parameter specifies the position from which to search. The string.includes() method is case-sensitive. Also, you can check if the string contains a substring by using a string.indexOf(term, start), which returns the index of the substring within the string instead of the boolean value returned by the string.includes(). In this JavaScript String Contains Substring example, we use the string.includes() to check if the substring is in the string. You can see more examples of searching for substrings in strings below, including using JavaScript Regular Expressions. Click Execute to run the JavaScript String Contains Substring Example online and see the result.
How do I split a string in JavaScript?
To split a string in JavaScript, you can use the string.split(separator, limit) method. The split() method splits the given string into an array of strings using "separator" as the delimiter. The second parameter determines how many times to split the string. The string.split() method returns a new array without changing the original string. In addition to the string.split() method, you can split a string using Regular Expressions (see example below). In this Split a String in JavaScript example, we are splitting a string using the split() method. An example of splitting a string using Regular Expressions in JavaScript is shown below. Click Execute to run the JavaScript Split String Example online and see the result.
How do I convert string to array in JavaScript?
To convert a string into an array in JavaScript, you can use the string.split(separator, limit), array.from(string) methods and the spread ("...") operator. The most commonly used method is the string.split(). It converts a string into an array of strings by splitting it with a "separator". The "separator" can be a character, a string, or a regular expression. The optional "limit" parameter specifies how many times to split the string. The array.from() method and the spread ("...") operator convert a string into an array of characters. In this JavaScript String to Array conversion example, we use the string.split() method to convert a string into an array of strings. Below you can see more examples of converting strings to arrays in JavaScript, including Regular Expressions. Click Execute to run the JavaScript String to Array Example online and see the result.
How do I create a multiline string in JavaScript?
To create a multiline JavaScript string, you can enclose the string in template literals `. These multiline strings may contain newlines (\n), tab characters (\t), and other special characters. In addition to creating multiline strings, template string literals provide other useful features, such as string interpolation. Alternatively, you can build a multi-line string using the concatenation (+) operator. Template string literals make code more readable and eliminate the need for string concatenation or character escapes. In this JavaScript example, we use template string literals to create a multi-line string containing HTML tags, tabs, and line breaks. Click Execute to run the JavaScript Multiline String example online and see the result. More JavaScript multiline string examples are provided below.
How do I reverse a string in JavaScript?
JavaScript does not have a built-in method for reversing a string. To reverse a string in JavaScript, you can use a combination of three built-in methods: split(), reverse(), and join(). The first method splits a string into an array of characters and returns a new array. The second method reverses the order of elements in an array (the first element becomes last, and the element becomes first). The third method is used to concatenate all elements of an array into a new string. Another way to reverse a string in JavaScript is to use a combination of the substr() and charAt() methods. The first method returns a substring of the string, and the second method returns the specified character of the string. You can also reverse a string with a for loop, using a decrement (or increment) loop to loop through per character of the string and create a new reversed string. In this JavaScript Reverse String example, we reverse a string using the split(), reverse(), and join() methods. Click "Run" to run the JavaScript string reversal example online and see the result.
How do I concatenate strings in JavaScript?
To concatenate strings in JavaScript, you can use the "+" operator or the string.concat(str1, str2, ...) method. The "+" operator creates a new string by concatenating strings to the left and right of the operator. The string.concat() method takes one or more strings and concatenates them into a new string. The string.concat() method does not modify the provided strings but creates and returns a new string resulting from the concatenation. In this JavaScript String Concatenate example, we use the string.concat() method to concatenate strings. More examples of string concatenation are given below. Click Execute to run the JavaScript String Concatenation Example online and see the result.
How do I get the length of a string in JavaScript?
To get the length of a string in JavaScript, you can to use the string.length property. The length property specifies how many characters the string contains (the length of an empty string is 0). When determining the length of a string, keep in mind that spaces and various characters are also part of the string; each one is a separate character. While the length property is commonly used with other methods in JavaScript, it's important to remember that length itself is not a method and is not calculated every time (so it's fast). In this example, we get the length of a JavaScript string using the length property. Click Execute to run the JavaScript String Length Example online and see the result.
How to trim a string using JavaScript?
To remove spaces from a string using JavaScript, you can use the string.trim() method. The trim() method removes spaces from both ends of a given string without changing the original string. The characters to be removed include space, tab, page, and line terminators (' ', \t, \r, \n, etc). The method returns a new string without any leading or trailing whitespace. To remove spaces within a string, you can use the string.replace() method. Like the string.trim() method, the string.replace() method does not change the original string but returns a copy of the string with all occurrences of the searched value replaced with the new value (see example below). In this JavaScript Trim whitespace from the string example, we remove spaces using the string.trim() method. Click Execute to run the JavaScript Trim String online and see the result
How to check if JavaScript string starts with a string using startsWith method?
To check if a string starts with another string in JavaScript, you can use the string.startsWith(searchString, index) method. The string.startsWith() method determines if the start of this string matches the specified string or character. The first parameter specifies the search string. The second parameter is optional and specifies the index in the given string from which to search. The default value is zero. The string.startsWith() method returns a boolean value - "true" if the given string starts with the specified string, "false" otherwise. You can also determine if a string ends with a specified string by calling the string.endsWith() method. The methods are case-sensitive. In this JavaScript String startsWith example, we check if a string starts with a given string using the startWith() method with the default "index" parameter. Click Execute to run the JavaScript String startsWith Example online and see the result.