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Sep 13, 2025
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Mention new Set() accepts undefined #41106

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4f2e3fd
Mention `new Set()` accepts `undefined`
fisker Sep 11, 2025
d4eb1b6
Change Map too
Josh-Cena Sep 12, 2025
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6 changes: 1 addition & 5 deletions files/en-us/web/javascript/reference/global_objects/map/map/index.md
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Expand Up @@ -22,11 +22,7 @@ new Map(iterable)
### Parameters

- `iterable` {{optional_inline}}
- : An {{jsxref("Array")}} or other
[iterable](/en-US/docs/Web/JavaScript/Reference/Iteration_protocols) object
whose elements are key-value pairs. (For example, arrays with two elements,
such as `[[ 1, 'one' ],[ 2, 'two' ]]`.) Each key-value pair is added to the
new `Map`.
- : If an [iterable object](/en-US/docs/Web/JavaScript/Reference/Iteration_protocols) (such as an array) is passed, all of its elements will be added to the new `Map`. Each element must be an object with two properties: `0` and `1`, which correspond to the key and value (for example, `[[1, "one"],[2, "two"]]`). If you don't specify this parameter, or its value is `null` or `undefined`, the new `Map` is empty.

## Examples

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6 changes: 1 addition & 5 deletions files/en-us/web/javascript/reference/global_objects/set/set/index.md
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Expand Up @@ -37,11 +37,7 @@ new Set(iterable)
### Parameters

- `iterable` {{optional_inline}}
- : If an [iterable object](/en-US/docs/Web/JavaScript/Reference/Statements/for...of) is passed, all of its elements will be added to the new
`Set`.

If you don't specify this parameter, or its value is `null`, the new
`Set` is empty.
- : If an [iterable object](/en-US/docs/Web/JavaScript/Reference/Iteration_protocols) (such as an array) is passed, all of its elements will be added to the new `Set`. If you don't specify this parameter, or its value is `null` or `undefined`, the new `Set` is empty.

### Return value

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