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Merge pull request #1950 from diegotc86/patch-2

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Update phrasing on "Comparison with ||"
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Ilya Kantor 2020-06-08 10:54:39 +03:00 • committed by GitHub
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1-js/02-first-steps/12-nullish-coalescing-operator/article.md
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@ -60,9 +60,9 @@ alert(height || 100); // 100
alert(height ?? 100); // 0 alert(height ?? 100); // 0
``` ```
Here, `height || 100` treats zero height as unset, same as `null`, `undefined` or any other falsy value. So zero becames `100`. Here, `height || 100` treats zero height as unset, same as `null`, `undefined` or any other falsy value. So the alert shows `100`.
The `height ?? 100` returns `100` only if `height` is exactly `null` or `undefined`. So zero remains "as is". The `height ?? 100` returns `100` only if `height` is exactly `null` or `undefined`. So the alert shows the height value `0` "as is".
Which behavior is better depends on a particular use case. When zero height is a valid value, that we shouldn't touch, then `??` is preferrable. Which behavior is better depends on a particular use case. When zero height is a valid value, that we shouldn't touch, then `??` is preferrable.