The includes() method determines whether a javascript array contains a specified element.
This method returns true if the array contains the element, and false if element not exist in array.
var list = ["A", "B", "C", "D", "E"];
console.log(list.includes("A")); // true
console.log(list.includes("A",1)); //returns false, as "A" is not present at index 1.
console.log(list.includes("B",1)); //returns True , as "B" is present at index 1.
console.log(list.indexOf("A") !== -1 ); // true
Array indexOf function
how to check exact position of element using indexOf JS method
indexOf(element) method, which search for element in the specified array and returns the index of its first occurrence, and -1 if the array does not contain element
var JSArr = ["A", "B", "C", "D"];
console.log(JSArr.indexOf("A")) // 0 found at postion 0
console.log(JSArr.indexOf("B")) // 1 found at postion 1
console.log(JSArr.indexOf("F")) // -1 not found
Example 2 using function
var JSArr = ["A", "B", "C", "D"];
if (JSArr.indexOf("A") !== -1) {
alert("Value exists");
} else {
alert("Value does not exists");
}
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