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Home/ Questions/Q 8864839
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Editorial Team
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Editorial Team
Asked: June 14, 20262026-06-14T16:21:13+00:00 2026-06-14T16:21:13+00:00

When trying to instantiate MyClass() s I get the following error. s = new

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When trying to instantiate MyClass()s I get the following error.

s = new MyClass();
> TypeError: 'undefined' is not a function (evaluating '_class.apply(this, arguments)')

The is the Class

class MyClass
    constructor: (@value = 'defaultValue')
    ….

Any idea what is causing this error?

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  1. Editorial Team
    Editorial Team
    2026-06-14T16:21:15+00:00Added an answer on June 14, 2026 at 4:21 pm

    The constructor needs to be a function so you need to specify ->:

    class MyClass
        constructor: (@value = 'defaultValue') ->
    

    Demo

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