The includes() method checks if one string can be found inside another string.
Example
const message = "JavaScript is fun";
// check if message includes the string "Java"
let result = message.includes("Java");
console.log(result);
// Output: true
includes() Syntax
The syntax of the includes() method is:
str.includes(searchString, position)
Here, str is a string.
includes() Parameters
The includes() method takes in:
- searchString - A string to be searched for within str.
- position (optional) - The position within str to begin searching for searchString. By default, it is 0.
includes() Return Value
- Returns true if searchString is found anywhere within str.
- Returns false if searchString is not found anywhere within str.
Note: The includes() method is case sensitive.
Example: Using includes() method
let sentence = "Java is to JavaScript what Car is to Carpet.";
let check = sentence.includes("Java");
console.log(check); // true
// case sensitive
let check1 = sentence.includes("java");
console.log(check1); // false
// second argument specifies position to start at
let check2 = sentence.includes("Java", 20);
console.log(check2); // false
let check3 = sentence.includes("whose");
console.log(check3); // false
let check4 = sentence.includes("");
console.log(check4); // true
Output
true false false false true
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