Why Angular 2 or Angular 4 use banana brackets? Is there any specific reason for that? Why...

I know, it is not related to any coding but they can follow the same syntax as in AngularJS

<input ng-model="hero.name" placeholder="name" type="text">


Angular 2 and its Greater Version Syntax till now

<input [(ngModel)]="hero.name" placeholder="name" type="text">


If they do so, it would be very helpful for people to adapt change in Angular JS ?

Similarly for ng-repeat, they changed to ngFor

<ul ngFor let-item [ngForOf]="items" let-i="index" [ngForTrackBy]="trackByFn">
<li>...</li>
</ul>


<ul ng-repeat="item in items track by myTrackingFunction(n)">
<li>...</li>
</ul>

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