js get index of item in array

1let myList = ['foo', 'bar', 'qux'];
2
3myList.indexOf('bar');	// 1

1const beasts = ['ant', 'bison', 'camel', 'duck', 'bison'];
2
3beasts.indexOf('bison'); //ouput: 1
4
5// start from index 2
6beasts.indexOf('bison', 2); //output: 4
7
8beasts.indexOf('giraffe'); //output: -1

1array.indexOf("item");

1var array = [2, 9, 9];
2array.indexOf(2);     // 0
3array.indexOf(7);     // -1
4array.indexOf(9, 2);  // 2
5array.indexOf(2, -1); // -1
6array.indexOf(2, -3); // 0

1search = (arr, item) => { return arr.indexOf(item); }

1var valueAtIndex1 = myValues[1];