Function helper

  • helper<T, S, Return>(context, helper, thunk?): {
        value: Return;
    }

  • This is not a core part of ember-resources, but is an example utility to demonstrate a concept when authoring your own resources. However, this utility is still under the broader library's SemVer policy.

    A consuming app will not pay for the bytes of this utility unless imported.

    implemented with raw invokeHelper API, no classes from ember-resources used.

    Enables the use of template-helpers in JavaScript

    Note that it should be preferred to use regular functions in javascript whenever possible, as the runtime cost of "things as resources" is non-0. For example, if using @ember/component/helper utilities, it's a common p practice to split the actual behavior from the framework construct

    export function plainJs() {}

    export default helper(() => plainJs())

    so in this case plainJs can be used separately.

    This differentiation makes less of a difference since plain functions as helpers will be supported soon.

    Type Parameters

    • T = unknown

    • S = InferSignature<T>

    • Return = Get<S, "Return", unknown>

    Parameters

    • context: object
    • helper: T
    • thunk: Thunk = DEFAULT_THUNK

    Returns {
        value: Return;
    }

    Example

    import intersect from 'ember-composable-helpers/addon/helpers/intersect';

    import { helper } from 'ember-resources/util/helper';

    class Demo {
      @tracked listA = [...];
      @tracked listB = [...]

      intersection = helper(this, intersect, () => [this.listA, this.listB])

      toString = (array) => array.join(', ');
    }

    {{this.toString this.intersection.value}}

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