Computer scienceProgramming languagesJavaScriptWorking with dataArrays

Array iterating

Theory

Three

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The given function receives an integer array. Return an index of the first element that has the value 3. If there is no such value, return -1.

Sample Input 1: 

[ 1, 2, 3 ]

Sample Output 1: 

2

Sample Input 2: 

[ 0, 3, 3, 2 ]

Sample Output 2: 

1

Sample Input 3: 

[ 1, 13, 4, 0 ]

Sample Output 3: 

-1
Write a program in JavaScript
function three(arr) {
//write your code here
}
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