Editorial: clarify that reduce skips first call based on initialValue#3818
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michaelficarra wants to merge 1 commit intomainfrom
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Editorial: clarify that reduce skips first call based on initialValue#3818michaelficarra wants to merge 1 commit intomainfrom
michaelficarra wants to merge 1 commit intomainfrom
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linusg
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Apr 9, 2026
| <h1>Array.prototype.reduce ( _callback_ [ , _initialValue_ ] )</h1> | ||
| <emu-note> | ||
| <p>_callback_ should be a function that takes four arguments. `reduce` calls the callback, as a function, once for each element after the first element present in the array, in ascending order.</p> | ||
| <p>_callback_ should be a function that takes four arguments. `reduce` calls _callback_ once for each element present in the array, in ascending order, skipping the first element unless _initialValue_ is provided.</p> |
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_callback_ is actually called with the first element, just as the first value rather than the second one. I wonder if the next paragraph might be enough to explain that we "skip" the first value, and here we could just write something like this? Without mentioning where we start from, or that we it is called on all elements.
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| <p>_callback_ should be a function that takes four arguments. `reduce` calls _callback_ once for each element present in the array, in ascending order, skipping the first element unless _initialValue_ is provided.</p> | |
| <p>_callback_ should be a function that takes four arguments. `reduce` calls _callback_ on the elements present in the array, in ascending order.</p> |
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This isn't actually true though.
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I don't know how you're getting that from what I posted. The function is not called.
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