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Quickest Method To Find If A Number Exists In An Array Of Numbers

Quickest Method To Find If A Number Exists In An Array Of Numbers
function xyz(arr, tar) {

  len = arr.length;
  if (len < 1) {
    console.log("Not found.");
    return
  }
  mid = Math.floor(len/2)
  if (tar === arr[mid]) {
    console.log("found", arr[mid]);
    return
  } else if (tar < arr[mid]) {
    xyz(arr.slice(0, mid), tar);
  } else if (tar > arr[mid]) {
    xyz(arr.slice(mid+1), tar);
  } else {
    console.log("Not found");
  }
}

array = [];
last = 0;
for (a = 0; a < 100; a++) {
    array.push(Math.floor(Math.random() * 1000));
}
array.sort((a, b) => a - b);
tar = 500;
console.log(array);
console.time('function');
xyz(array, tar, array[0]);
console.timeEnd('function');
Run the above code here: https://repl.it/@VinitKhandelwal/quickest-find-element-in-array

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