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Programming-Idioms

Look for a negative value v in 2D integer matrix m. Print it and stop searching.
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OUTER:
for (var i in m) {
   for (var j in m[i]) {
      if (m[i][j] < 0) {
         console.log("Negative value found: "+m[i][j]);
         break OUTER;
      }
   }
}