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When you modify the length of the array, e.g. vm.items.length = newLength
To deal with caveat 2, you can also use splice:
example1.items.splice(newLength)
But when the newLength Is greater than the current length, this methods failure.
for example
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chrisvfritz commentedon Jun 21, 2017
I just update the docs to remove the
alsoinyou can also use splice. Hopefully, this makes it clearer that we recommendspliceas an alternative to directly setting the length of an array.As an aside, I don't actually recommend setting
lengthto increase the size of an array in JavaScript. What you get at the end is not actually an array with 8 indices pointing to the valueundefined, as it would appear, but rather 8 indices with undefined pointers. The difference is subtle, but has important implications. For example, if you try tomapover this array witha.map(() => 3), what you'll get is[3, 3, undefined x 8], rather than[3, 3, 3, 3, 3, 3, 3, 3, 3, 3]as you might expect.