Angular2 can bind css class as follows `[class.fa-train]="true"`, but can I bind them at runtime (something like `[class[key]]="true"`) ? For example, I have an array: ```javascript ['fa-train', 'fa-subway', 'fa-bed'] ``` I would like to convert them as follows: ```javascript <i class="fa fa-train"></i> <i class="fa fa-subway"></i> <i class="fa fa-bed"></i> ```
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