I don’t understand anything about “You should be using correct index to modify the value in myArray.”
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// Example
var ourArray = [1,2,3];
ourArray[1] = 3; // ourArray now equals [1,3,3].
// Setup
var myArray = [1,2,3];
// Only change code below this line.
var myArray = [3,2,3];
ourArray[?] = ?