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var array = ['aaa', 'bbb', 'ccc', 'ddd', 'eee'];
for (var index in array) {
console.log(index + ': ' + array[index]);
}
console.log(index);
// 0: aaa
// 1: bbb
// 2: ccc
// 3: ddd
// 4: eee
// 4
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