Substring Helper Function in HTML not working

[montezh2001]

Hello, 

I have the following code in my HTML I'm trying to use. This code looks for a Campaign Name attribute and applies the corresponding couponID. However, when I try to save this code, I get an "invalid helper substr" error. 

{{#each profile._*********.walletInfo.couponDetails as |coupon|}} {%#if contains(coupon.campaignName,"NA_EM_2025_Coupon_Launch" ) %} {% substr(coupon.couponId,38) %} {%else%} No Valid Coupon Available {%/if%}{{/each}}

Please advise

[SatheeskannaK · Accepted solution]

@montezh2001 the substr function is missing the syntax. try along these lines,

{{#each profile._*********.walletInfo.couponDetails as |coupon|}}
{%#if contains(coupon.campaignName,"NA_EM_2025_Coupon_Launch") %}
{%= substr(coupon.couponId,0,2) %}
{%else%} No Valid Coupon Available {%/if%}
{{/each}}

[MontexHo]

Thank you @SatheeskannaK .

This worked, despite the documentation stating having the ending index is an option.