Help / Release / J 6.01 / : Explicit Names Changed
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Explicit Names Changed |
initial writing: 2006-01-26 |
In an explicit definition, a name assigned by the copula =. is made local. A name assigned by =: is global, except that global assignment to a local name is not permitted. Locative assignment (using either =: or =.) is always global.
The arguments in an explicit definition have been changed to x y u v m n from x. y. u. v. m. n. . For example:
pow=: 4 : '*/ *:^:(I.|.#:y) x' " 0 3x pow 12 50 531441 717897987691852588770249
For compatibility, use of x. etc. will be permitted, and existing explicit definitions will continue to work except if they use x etc. as global names. The effects for a dyadic verb are as follows:
| J 5.04 | J 6.01 | |
| foo=: 4 : 0 x.=. (left argument) |
foo=: 4 : 0 x=. x.=. (left argument) |
The Explicit Argument Names flag is a temporary facility that controls whether the names x. y. u. v. m. n. are permitted. 9!:48 queries the flag; 9!:49 sets it.