Write-up for LeetCode problem 2703. Return Length of Arguments Passed #399
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miorel
requested review from
VolodymyrSemenov,
elimanzo,
simona1,
volkmchl and
yulianka
elimanzo
approved these changes
Aug 31, 2024
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| Fun fact, `arguments` don't work the same way in arrow functions. [The documentation](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Functions/Arrow_functions) phrases it: | ||
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| > Arrow functions don't have their own bindings to `this`, `arguments`, or `super` |
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ah thanks for the reminder, I was wondering why using arguments wasn't working with arrow functions
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| However, in TypeScript, omitting the rest parameter will result in a type error in the code LeetCode uses to invoke our function! A common practice is to prefix the names of unused variables with an underscore: |
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| If the arrow function is defined in the global scope, we'll get a `ReferenceError` that `arguments` is not defined. If the arrow function is defined within the body of a non-arrow function, we'll be accessing the `arguments` of the enclosing function! | ||
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| You can test with the following code: | ||
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| ```js | ||
| function enclosing() { | ||
| const arrow = () => arguments.length; | ||
| return arrow(); | ||
| } | ||
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| console.log(enclosing("a", "b", "c")); // prints 3 | ||
| console.log(enclosing("a", "b")); // prints 2 |
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