STRING METHODS IN JAVASCRIPT PART-2
JavaScript provides a wide range of string methods to manipulate and interact with strings. Here’s a categorized list of common string methods:
1. String Manipulation
concat(): Combines two or more strings.
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let str1 = "Hello";
let str2 = "World";
console.log(str1.concat(" ", str2)); // Output: "Hello World"
toUpperCase(): Converts a string to uppercase.
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console.log("hello".toUpperCase()); // Output: "HELLO"
toLowerCase(): Converts a string to lowercase.
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console.log("HELLO".toLowerCase()); // Output: "hello"
trim(): Removes whitespace from both ends of a string.
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console.log(" Hello World ".trim()); // Output: "Hello World"
replace(): Replaces a substring with another substring.
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console.log("Hello World".replace("World", "JavaScript")); // Output: "Hello JavaScript"
replaceAll(): Replaces all occurrences of a substring.
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console.log("Hello Hello".replaceAll("Hello", "Hi")); // Output: "Hi Hi"
2. Accessing String Content
charAt(): Returns the character at a specified index.
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console.log("JavaScript".charAt(4)); // Output: "S"
charCodeAt(): Returns the Unicode of the character at a specified index.
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console.log("A".charCodeAt(0)); // Output: 65
includes(): Checks if a string contains a specified substring.
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console.log("JavaScript".includes("Script")); // Output: true
startsWith(): Checks if a string starts with a specified substring.
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console.log("JavaScript".startsWith("Java")); // Output: true
endsWith(): Checks if a string ends with a specified substring.
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console.log("JavaScript".endsWith("Script")); // Output: true
3. Extracting Parts of Strings
slice(): Extracts a section of a string and returns it as a new string.
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console.log("JavaScript".slice(0, 4)); // Output: "Java"
substring(): Similar to slice() but does not accept negative indexes.
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console.log("JavaScript".substring(0, 4)); // Output: "Java"
substr(): Extracts a substring based on a start index and length (deprecated).
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console.log("JavaScript".substr(0, 4)); // Output: "Java"
4. Splitting and Joining
split(): Splits a string into an array of substrings.
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console.log("Hello,World".split(",")); // Output: ["Hello", "World"]
**join()
5. Searching in Strings
indexOf(): Returns the index of the first occurrence of a substring.
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console.log("Hello World".indexOf("World")); // Output: 6
lastIndexOf(): Returns the index of the last occurrence of a substring.
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console.log("Hello World World".lastIndexOf("World")); // Output: 12
search(): Searches for a match using a regular expression and returns the index.
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console.log("Hello World".search("World")); // Output: 6
match(): Returns an array of matches based on a regular expression.
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