Handlebars if statement with index = some value - handlebars.js

Question

I'm trying to create a table that populates each table cell with an object from a JSON file. My handlebars template just adds a with the data for each object. What I'm trying accomplish is for every 5th item a new row is created and then it continues populating out the table cells until the 10th item then it creates a new row etc.
I've been reading up on #index. Is there some function that does something like {{#if #index / 5 == 0}} ? Otherwise is there something handlebars offers that could achieve the functionality I'm trying to do? I'm not confined to use a table I just figured that was the best option to put the data.
My current template. Thanks for any help! I edited this below using a handlebars helper. But the information still doesn't render. There is additional code that compiles the template after the end of this but it includes a very long json array in the local file for testing.
<script type = "text/x-handlebars-template" id="itemTemplate">
<table class="tableStyle">
<tr>
{{#each all_coupons}}
{{#ifPos}}
<tr>
<td>
<div class="wrapper">
<div class="header">{{coupon_title}}</div>
<div class="column_wrapper">
<div class="two-col">
<div class="product_image"><img src="{{coupon_thumb}}" alt="Apple" height="110" width="110"></div>
<div class="description">{{coupon_description}}</div>
</div>
</div>
<div class="expiration">Valid From: {{valid_from}} to {{valid_to}}</div>
</div>
</td>
</tr>
{{else}}
<td>
<div class="wrapper">
<div class="header">{{coupon_title}}</div>
<div class="column_wrapper">
<div class="two-col">
<div class="product_image"><img src="{{coupon_thumb}}" alt="Apple" height="110" width="110"></div>
<div class="description">{{coupon_description}}</div>
</div>
</div>
<div class="expiration">Valid From: {{valid_from}} to {{valid_to}}</div>
</div>
</td>
{{/ifPos}}
{{/each}}
</tr>
<table>
</script>
<script type="text/javascript" src="js/jquery.js"></script>
<script type="text/javascript" src="js/handlebars.js"></script>
<script type="text/javascript" src-"js/handlebars.runtime-v1.3.0.js"></script>
<script type="text/javascript">
Handlebars.registerHelper('ifPos', function (context, options) {
var pos = false;
for (var i = 0, j = context.length; i < j; i++) {
if (context.length/5 == 0)
{
pos = true;
}
else {
pos = false;
}
}
console.log(pos);
return pos;
});

Answer 1

context.length/5 == 0
will not give you the value you want every 5th element. As 5/5 is 1, better to use modulus(%) which gives you the remainder, this way when it equals 0 you know it has gone into it whole.
Also when wanting to do your own if/else block handle bars provides you with options.fn and options.inverse. Return options.fn(//whatever you want to pass to the if block) or options.inverse(//what ever to provide to the else block) from your helper to go into the relevant part of the block.
Here is a code pen showing a quick example of how you could get the index position of the element you are iterating over and apply a styling based on that.
The helper functions will go to the true part of the if block when index % 3 is 0 (the first, because it is a 0 based index, and then every 3rd element. All other times it will go to the else
Helper
Handlebars.registerHelper('ifThird', function (index, options) {
if(index%3 == 0){
return options.fn(this);
} else {
return options.inverse(this);
}
});
Template
<script id="template" type="text/x-handlebars-template">
{{#each this}}
<p class="{{#ifThird #index}}
red
{{else}}
blue
{{/ifThird}}">{{#index}} - {{name}}</p>
{{/each}}
</script>