cfd5a8ea3a
Instead of raising KeyError. These semantics match JavaScript behaviour
and make it much more seamless to pass Python dicts through to JavaScript
as though they were JavaScript {} objects.
Signed-off-by: Damien George <damien@micropython.org>
35 lines
1.0 KiB
JavaScript
35 lines
1.0 KiB
JavaScript
// Test passing a Python dict into JavaScript, how it behaves with undefined keys.
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// If JavaScript accesses a key that does not exist, `undefined` should be returned.
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// This is different to Python-side behaviour, where `KeyError` is raised.
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const mp = await (await import(process.argv[2])).loadMicroPython();
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// Create a JavaScript function with default arguments.
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// When `value` is `undefined` it will receive its default.
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function withDefault({ value = "OK" } = {}) {
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console.log(value);
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}
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globalThis.withDefault = withDefault;
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// Call the function from JavaScript with various arguments.
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withDefault();
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withDefault({});
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withDefault({ value: null });
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withDefault({ value: undefined });
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withDefault({ value: () => {} });
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console.log("====");
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// Call the function from Python with the same arguments as above.
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// The results should be the same.
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mp.runPython(`
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import js
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js.withDefault()
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js.withDefault({})
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js.withDefault({"value": None})
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js.withDefault({"value": js.undefined})
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js.withDefault({"value": (lambda: {})})
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`);
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