> > (I assume with a runtime rather than a compiler error, but I haven’t tried > it)
Nope, compiler catches the overflow: https://play.golang.org/p/taorqygqxFz On Tue, Jun 22, 2021 at 6:39 PM David Riley <fraveyd...@gmail.com> wrote: > On Jun 22, 2021, at 11:39, Vaibhav Maurya <vaibhav.se...@gmail.com> wrote: > > > Hi, > > Please help me to understand the following syntax mentioned in the Golang > language specification document. > > https://golang.org/ref/spec#Composite_literals > > following is the search string for CTRL + F > // vowels[ch] is true if ch is a vowel \ > > Following declaration and initialization is confusing. > vowels := [128]bool{'a': true, 'e': true, 'i': true, 'o': true, 'u': true, > 'y': true} > > Here one can see the vowels is an array. Where in the array initialization > syntax, there is a key value pair. I believe *bool *is the primitive > type, so the array values should be either true or false. > Why there are key value pair separated by colon in the initialization. > > > In this case, it is because the single quotes create a literal rune, which > ultimately is an integer; this is creating an array 128 wide of bools, of > which only the values indexed by those character values are initialized > (everything else is the zero value, or false). > > This example only works for characters in the 7-bit ASCII subset of UTF-8; > if you were to put other characters in which had rune values greater than > 127, this would break (I assume with a runtime rather than a compiler > error, but I haven’t tried it). Likewise, I think this only works for array > literals; I don’t think (though again have not tried it) that you can > declare slice literals with only selected members initialized. > > > - Dave > > -- > You received this message because you are subscribed to the Google Groups > "golang-nuts" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to golang-nuts+unsubscr...@googlegroups.com. > To view this discussion on the web visit > https://groups.google.com/d/msgid/golang-nuts/2564C639-E055-4DD9-97A2-9B6061F83006%40gmail.com > <https://groups.google.com/d/msgid/golang-nuts/2564C639-E055-4DD9-97A2-9B6061F83006%40gmail.com?utm_medium=email&utm_source=footer> > . > -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/golang-nuts/CAEkBMfGxAQEHy32157s9sWu0f1qQ3cZ%3DoLwk%2BrjyQmUnmrt1oA%40mail.gmail.com.
