How to check if array contains a string in JQuery?

 In jQuery, you can use the $.inArray() method to check if an array includes a particular value or not. Here's an example:

javascript
const arr = ['apple', 'banana', 'orange', 'grape'];

console.log($.inArray('orange', arr) !== -1); // Output: true
console.log($.inArray('mango', arr) !== -1); // Output: false

In this example, the $.inArray() method is used to check if the arr array includes the values 'orange' and 'mango'.

The $.inArray() method takes two arguments: the value to check for in the array, and the array itself. If the value is found in the array, the method returns the index of the value in the array (which will be a non-negative integer), otherwise it returns -1.

To check if a value is present in the array, we can compare the result of $.inArray() to -1 using the inequality operator !==. If the result is not equal to -1, it means the value is present in the array, otherwise it is not.

In the first console.log() statement, the $.inArray() method returns the index 2, which is not equal to -1, so the output is true because the value 'orange' is present in the arr array. In the second console.log() statement, the $.inArray() method returns -1, which is equal to -1, so the output is false because the value 'mango' is not present in the arr array.

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