function tekaTekiTeko(batas) {
    // untuk ngevalidasi bahwa batas yang dimasukkan harus number, integer, bukan angka negatif, juga minimal 20
    if (
      typeof batas !== 'number' ||
      !Number.isInteger(batas) ||
      batas < 20
    ) {
      throw new Error('Parameter harus angka positif (unsigned integer) dengan nilai minimal 20'); //ketika parameter nya gak sesuai
    }
 
    for (let i = 1; i <= batas; i++) {
      let output = '';
 
      if (i % 2 === 0) output += 'Teka';
      if (i % 3 === 0) output += 'Teki';
      if (i % 5 === 0) output += 'Teko';
 
      // cetak hasil
      console.log(output || i);
    }
  }
 
  // testing
  try {
    tekaTekiTeko(30);
  } catch (error) {
    console.error('Terjadi error:', error.message);
  }
 

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