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var rows=[
  [1,2,3,4],
  [5,6,7,8],
  [9,10,11,12],
  [13,14,15,16],
]
var arrayIndex=1;
var valuesToAdd=[22,33,44];
rows[arrayIndex]=rows[arrayIndex].concat(valuesToAdd);
console.log(rows);
console.log(rows[arrayIndex]); //[5, 6, 7, 8, 22, 33, 44]
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anonymouspro
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