js array index

const beasts = ['ant', 'bison', 'camel', 'duck', 'bison'];

console.log(beasts.indexOf('bison'));
// expected output: 1

// start from index 2
console.log(beasts.indexOf('bison', 2));
// expected output: 4

console.log(beasts.indexOf('giraffe'));
// expected output: -1

4.57
7
Snumpy 105 points

                                    var array = [2, 9, 9];
array.indexOf(2);     // 0
array.indexOf(7);     // -1
array.indexOf(9, 2);  // 2
array.indexOf(2, -1); // -1
array.indexOf(2, -3); // 0

4.57 (7 Votes)
0
3.5
8

                                    var fruits = ["Banana", "Orange", "Apple", "Mango"];
return fruits.indexOf("Apple"); // Returns 2

3.5 (8 Votes)
0
0
5

                                    let first = fruits[0]
// Apple

let last = fruits[fruits.length - 1]
// Banana

0
0
4.25
4

                                    // for dictionary case use findIndex 
var imageList = [
   {value: 100},
   {value: 200},
   {value: 300},
   {value: 400},
   {value: 500}
];
var index = imageList.findIndex(img => img.value === 200);

4.25 (4 Votes)
0
0
8
Seub 105 points

                                    The Array. of() method creates a new Array instance from a variable number of 
arguments, regardless of number or type of the arguments. The difference between
Array. of() and the Array constructor is in the handling of integer arguments: Array.

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