data binding - Dynamically set attribute on component in html template angular 2 -

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i trying set attribute on component if expression true. give me example?

what have now:

 <div [danger]="inarray(choice.likers, user, id)"></div>

but not compile.

inarray own method returns true or false. see is, if expression returns true, output be

<div danger></div>

in angular 1 there this: ng-attr-... statement did above.

to set attribute use attribute binding:

 <div [attr.danger]="inarray(choice.likers, user, id)"></div>

if want show empty attribute conditionally return empty string or null in inarray():

inarray() {     let value;     if (isinarray) {       value = '';     } else {       value = null;     }     return value;   }

so attribute empty or danger attribute dont exist. result is:

<div danger></div>

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