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Check if value exists in array javascript

Answers 2

```
<script>    
    var fruits = ["Apple", "Banana", "Mango", "Lemon", "Orange", "Papaya"];
    if(fruits.indexOf("Lemon") !== -1){
        document.write("Value exists!");
    } else{
        document.write("Value does not exists!");
    }
</script>
```
0

The indexOf() method returns the index number of the specified element. If the specified element exists in the array it returns the value (0, 1, 2, 3, and so on) as per the index number of the element. If the element does not exist in the array it returns -1. The indexOf() method is case sensitive. It treats “Lemon” and “lemon” as different values. The IndexOf() method returns -1 on NaN, even (NaN) value exists in the array. But includes() method treats it (NaN) as a different way and returns true.

<script>    
    var fruits = ["Apple", "Banana", "Mango", "Orange", "Papaya"];
    document.write("[\"Apple\", \"Banana\", \"Mango\", \"Orange\", \"Papaya\"]" + "<br/><br/>");
    document.write("True means value exists in the array and false means value does not exist in the array."+ "<br/> <br/>");
    document.write("Search Banana : " + fruits.includes("Banana") + "<br>"); // Outputs: true
    document.write("Search banana : " + fruits.includes("banana") + "<br>"); // Outputs: false
    document.write("Search Coconut : " +  fruits.includes("Coconut") + "<br>"); // Outputs: false
    document.write("Search Orange : " + fruits.includes("Orange") + "<br>"); // Outputs: true
    document.write("Search ORange : " + fruits.includes("ORange") + "<br>"); // Outputs: false
    document.write("Search Cherry : " + fruits.includes("Cherry")); // Outputs: false
</script>

Includes method returns true and false as output. It returns true if the specified value exists in the array and returns false if the value does not exist in it. The Includes method is case sensitive. Includes method can be implemented on string also. You can use this method to check if value exists in array or not. javascript includes() method, var fruits = ["Apple", "Banana", "Mango", "Orange", "Papaya"]; fruits.includes("Banana");.

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