This page provides the most commonly used JavaScript string methods that help you manipulate strings effectively.
Section 1. Searching #
Mastering the string search methods can help you analyze text more efficiently. These sections introduce the string search methods that allow you to locate and verify substrings within strings.
- search() – locate a substring in a string using a regular expression.
- indexOf() – get the index of the first occurrence of a substring in a string.
- lastIndexOf() – find the index of the last occurrence of a substring in a string.
- includes() – check if a string contains a substring.
- startsWith() – check if a string starts with another string.
- endsWith() – determine if a string ends with another string.
Section 2. Trimming #
This section introduces the string trimming methods that allow you to remove unwanted whitespace characters from a string, ensuring your text is clean and well-formatted.
- trim() – remove whitespace characters from a string.
- trimStart() – remove the leading whitespace characters of a string.
- trimEnd() – remove the ending whitespace characters of a string.
Section 3. Padding #
Padding strings is a useful technique for formatting text. This section introduces two string methods padStart() and padEnd() for padding strings.
- padStart() – pad the beginning of a string with another string until the resulting string reaches a specified length.
- padEnd() – pad the end of a string with another string until the resulting string reaches a certain length.
Section 4. Extracting #
This section introduces the extracting string methods that allow you to break down strings into smaller pieces and extract specific substrings:
- split() – split a string into an array of substrings.
- substring() – extract a substring from a string.
- slice() – extract a part of a string.
Section 5. Concatenating & interpolating #
Learn how to concatenate strings and substitute variables directly within strings using template literals.
- concat() – concatenate multiple strings into a new string.
- Template literals – learn how to use template literal to substitute variables directly within a string in a more flexible and readable way.
Section 6. Replacing #
This section introduces replacing string methods that allow you to perform data cleaning and transformation effectively.
- replace() – replace a substring in a string with a new one.
- replaceAll() – replace all occurrences of a substring that matches a pattern with a new one.
Section 7. Changing cases #
This section introduces various case-changing methods that allow you to convert characters in strings to lowercase or uppercase.
- toUpperCase – return a string with all characters converted to uppercase.
- toLowerCase – return a string with all characters converted to lowercase.
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