How to get length of array in template syntax

Question

I am trying to evaluate the below in template syntax which is an array:

FAIL 
{{ cols.length }}

I get the below error.

platfo         


        

Answer 1

Try defining the cols variable as an object list on .ts archive cols: object[];

If you want to print 0 for an empty array use the ternary operator:

{{ cols ? cols.length : '0' }}