Syntax for calling helper function from {{#each ..}}

msageryd

I have a helper function which returns an array. This function cannot be caller directly in a {{#each }} clause like this:

{{#each getFlattenedControlpointArray}}

In order to actually call the function I have to fake a parameter like this

{{#each (getFlattenedControlpointArray 1)}}

Is this a bug or have I misunderstood something?

bjrmatos

hi!

This function cannot be caller directly in a {{#each }} clause like this:
{{#each getFlattenedControlpointArray}}

yes, this is expected, you are passing here a function to the each, which expects an array, if we translate this to javascript execution it will look like this

// it won't do nothing because it expects array to iterate
each(function getFlattenedControlpointArray () {})

In order to actually call the function I have to fake a parameter like this
{{#each (getFlattenedControlpointArray 1)}}

in this case your are executing the getFlattenedControlpointArray function the ( and ) are needed for handlebars to execute functions/helpers when we are in the execution of another helper (the #each)

if we translate this to javascript execution it will look like this:

// this time it works because it is executing the `getFlattenedControlpointArray` and passing the return to the each
each(getFlattenedControlpointArray(1))

FYI you don't need the pass a fake parameter, it also works with this {{#each (getFlattenedControlpointArray)}}

https://playground.jsreport.net/w/anon/tDUXYi84

Is this a bug or have I misunderstood something?

it is how the handlebars syntax works, in case you need here is link to handlebars docs that explains this

hope this makes things more clear to you

msageryd

Of course, I should have thought of that.
Thank you for explaining.