Correct.
On Tue, May 1, 2018 at 7:36 AM Alisdair <[email protected]>
wrote:
> Isn't `for { ... if cond { break; } }` the same as `do {...} while cond`?
> Whilst having the benefits of not adding new keywords and maintaining the
> logic of the loop entirely within the block of the loop making it simpler
> to understand.
>
> On Tue, 1 May 2018 at 14:56, Michael Jones <[email protected]>
> wrote:
>
>> Maybe he meant "until" aka "do {...} while cond" -- this is a valuable
>> and missing mechanism. The argument back in the day was that having just
>> one looping construct was more friendly to tooling.
>>
>> On Tue, May 1, 2018 at 5:45 AM Ian Lance Taylor <[email protected]> wrote:
>>
>>> On Tue, May 1, 2018 at 4:11 AM, Hugh Fisher <[email protected]>
>>> wrote:
>>> >
>>> > Another observation from this novice Go programmer: I'm puzzled why
>>> > there's no while statement.
>>> >
>>> > I know it's possible to use a for, but it doesn't feel right to me. I
>>> always
>>> > think of for loops as for iterating over data structures. Originally
>>> just
>>> > arrays, but languages like Python and Objective-C have extended for
>>> > loops to other collections as well. "Looping until some condition is
>>> met"
>>> > for me is a different control structure and needs a different keyword.
>>> >
>>> > There'd be overlap with the for statement, but if-then-else and switch
>>> > with boolean case overlap too.
>>> >
>>> > And since while has been a reserved keyword in a lot of programming
>>> > languages for many decades, I would bet a reasonable amount of
>>> > money that a while statement could be added to Go right now and not
>>> > break anyone's production code.
>>>
>>> A `while` statement would presumably be exactly identical to a `for`
>>> statement with a single condition. So adding a `while` statement
>>> would not add any power to the language, and would add an additional
>>> keyword. All language choices are a cost benefit decision. In this
>>> case the benefit is a looping construct that some people will find
>>> clearer to read and write, and the cost is a new keyword that
>>> everybody needs to learn, and that at this point in the language's
>>> evolution will likely break some, even if not much, existing code. I
>>> don't think the benefit is worth the cost.
>>>
>>> Ian
>>>
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>>
>>
>> --
>> Michael T. Jones
>> [email protected]
>>
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>
--
Michael T. Jones
[email protected]
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