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//indexOf example
var fruits = ['Banana', 'Blackcurrant', 'Blueberry', 'Chili pepper', 'Cranberry', 'Eggplant', 'Gooseberry'];
// You get their index ( Key )
var index = fruits.indexOf('Blueberry');
// output 2
// if value not available
var index = fruits.indexOf('Apple');
// output -1
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