Angular Material Table dynamic columns

I have created mat-table component which generate dynamic columns by data which I pasted, but without Action icons.

<table mat-table [dataSource]="data" class="mat-elevation-z8">

<ng-container [matColumnDef]="item.columnDef" *ngFor="let item of columns; let i = index">
<th mat-header-cell *matHeaderCellDef>{{ item.header }}</th>
<td mat-cell *matCellDef="let element">{{ element[item.columnDef] }}</td>
</ng-container>

<tr mat-header-row *matHeaderRowDef="displayedColumns"></tr>
<tr mat-row *matRowDef="let row; columns: displayedColumns"></tr>
</table>


Data are pasted by Input() from another component.

columns: Column [] = [
{columnDef: 'faculty_id', header: 'ID'},
{columnDef: 'faculty_name', header: 'Faculty'},
{columnDef: 'faculty_description', header: 'Description'},
{columnDef: 'action', header: 'Actions', actions: [
{type: tableActionsType.Edit, icon: 'edit', matTooltip: 'Edit'},
{type: tableActionsType.Delete, icon: 'delete', matTooltip: 'Delete'}
]}
];


I need to check in this loop *ngFor="let item of columns; when item.columnDef === 'action' and render mat-icon.

<ng-container [matColumnDef]="item.columnDef" *ngFor="let item of columns; let i = index">
<th mat-header-cell *matHeaderCellDef>{{ item.header }}</th>
<td mat-cell *matCellDef="let element">

// if item.columnDef == 'action' then mat-icon
// else {{ element[item.columnDef] }}

<mat-icon aria-hidden="false" aria-label="edit" *ngFor="let icon of item.actions" [matTooltip]="icon.matTooltip" (click)="check()">{{icon.icon}}</mat-icon>

</td>
</ng-container>


I want to generate a column Actions with icons.

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