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let arr = ["ball", "1f7g", "spoon", "2c8d", "pen", "9c3c"];
//making the array
let index = arr.indexOf("ball")

let nextItem = null;
let arrLength = (arr.length);

if (index >= 0 && index < arrLength) {
	nextItem = arr[index + 1];
}

console.log(nextItem)