只有一个参数的拼接不会删除整个数组

Question

 a = ['a','b','c','d','e']; console.log(a.splice(1)); console.log(a);

In splice documentation, it says that skipping the delete parameter will delete all array items, yet here they're not; the first one is left out. Why is this?

Edit: My expectations was that haveing the omission of the delete parameter would cause to delete all the items of the array. But now after read Baconnier comment I understand that removes all after the index (first parameter).

then all the elements from start to the end of the array will be deleted. start being 1 in your case.

Answer 1

a = ['a','b','c','d','e'];
console.log(a.splice(0));
console.log(a);

Arrays start at 0, if you want to delete all elements including the first one you need to pass 0 as the first parameter.