The golang blog states :
"A slice can also be formed by "slicing" an existing slice or array. Slicing is done by specifying a half-open range with two indices separated by a colon. For example, the expression b[1:4] creates a slice including elements 1 through 3 of b (the indices of the resulting slice will be 0 through 2)."
Can someone please explain to me the logic in the above. IE. Why doesn't b[1:4] reference elements 1 through 4? Is this consistent with other array referencing?
分享 The reason is given in the Go Language Specification section on Slices.
For a string, array, or slice a, the primary expression
a[low : high]constructs a substring or slice. The index expressions low and high select which elements appear in the result. The result has indexes starting at 0 and length equal to high - low.
For convenience, any of the index expressions may be omitted. A missing low index defaults to zero; a missing high index defaults to the length of the sliced operand.
It's easy and efficient to calculate the length of the slice as high - low.
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