JavaScript variable object key

Moki Lv6
  2022-04-01 09:40:01 2022-04-01 09:40:01 Created   2022-04-01 09:40:01 2022-04-01 09:40:01 Updated   
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var key = 'test';
{key: 'value'}

Result:

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{
    key: 'value'
}
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var key = 'test';
{[key]: 'value'}

Result:

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{
    test: 'value'
}
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var key = 'test';
var obj = {};
obj[key] = 'value';

Result:

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{
    test: 'value'
}
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JavaScript variable object key