1var colors = ["red", "blue", "green"];
2var hasRed = colors.includes("red"); //true
3var hasYellow = colors.includes("yellow"); //false

1 var fruits = ["Apple", "Banana", "Mango", "Orange", "Papaya"];
2    
3    // Check if a value exists in the fruits array
4    if(fruits.indexOf("Mango") !== -1){
5        alert("Value exists!")
6    } else{
7        alert("Value does not exists!")
8    }

1const pets = ['cat', 'dog', 'bat'];
2
3console.log(pets.includes('cat'));
4// output: true

1const array1 = [1, 2, 3];
2
3console.log(array1.includes(2));
4// expected output: true
5
6const pets = ['cat', 'dog', 'bat'];
7
8console.log(pets.includes('cat'));
9// expected output: true
10
11console.log(pets.includes('at'));
12// expected output: false

1[1, 2, 3].includes(2);     // true
2[1, 2, 3].includes(4);     // false
3[1, 2, 3].includes(1, 2);  // false (second parameter is the index position in this array at which to begin searching)

1var boolValue = array.includes(item);