Hello,

To check argument types in functions that are used in many different
places, I have been using this:
Hello,

To check argument types in functions that are used in many different
places, I have been using this:

function someCoreFunction( domnode, text ) {

    // "Cheap runtime assert": fails when `domnode` is not a DOM node.
    domnode.childNodes.a;
         
    // Same idea, for a string.
    text.substring.a;

    // Rest of the function
    // ...

}

It helps to catch mistakes early, including during development. I am
*not* advocating to litter the code with thousands such statements,
but in a few strategical places the benefits can exceed the costs.

Hopefully this can help someone. Constructive feedback is welcome.

Guillaume

function someCoreFunction( domnode, text ) {

    // "Cheap runtime assert": fails when `domnode` is not a DOM node.
    domnode.childNodes.a;
         
    // Same idea, for a string.
    text.substring.a;

    // Rest of the function
    // ...

}

It helps to catch mistakes early, including during development. I am
*not* advocating to litter the code with thousands such statements,
but in a few strategical places the benefits can exceed the costs.

Hopefully this can help someone. Constructive feedback is welcome.

Guillaume

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