Angular 5 loop array - arrays

Question

I am really a beginner in angular ionic and stuff. Here, my problem is I have tried using *ngFor to iterate someArr and pass to [something]="" but my page became blank after adding it. Can someone help me.
someArr = [1, 2, 3, 4, 5, 6]
<ion-content>
<myHeader *ngIf="qArr.length && qArr[cPg].letter === 'A'" [something]="">
</myHeader>
<myHeader *ngIf="qArr.length && qArr[cPg].letter === 'B'" [something]="">
</myHeader>
</ion-content>

Answer 1

When using ngFor you are creating local variable based on a class variable so you will have something like :
<div *ngFor="let item of someArr"></div>
where someArr is the class var = [1, 2, 3, 4, 5, 6]
So inside your div, you will have access to each item using this :
<div *ngFor="let item of someArr">
<p *ngIf="item === myFunction(item)"> {{ item }} </p>
</div>

Answer 2

Can you show what you've tried with ngFor?
Should looks something like this
<div *ngFor="let val of someArr">
{{val}}
</div>
Sidenote, you cannot combine ngFor and ngIf inside same tag
meaning this will not work
<div *ngFor="let val of someArr" *ngIf="val === 1">
{{val}}
</div>
But this would work
<div *ngFor="let val of someArr">
<div *ngIf="val === 1">
{{val}}
</div>
</div>
Update
something is not a real attribute, so we have no idea what you're refering to.
However you should be able to assign values to attribute. Take id attribute for instance
<div *ngFor="let val of someArr">
<div [id]="val">
{{val}}
</div>
</div>