Amend: Difference between revisions

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Revision as of 05:57, 8 October 2021

Amend

@[x;y[;z];u]

Amend is a special form of the @ verb which takes multiple arguments.

Amend takes 3 or 4 arguments, where:

3 argument amend always acts as an element replacement function, since z is : if it is omitted.

x can be a value or a symbol. If given a symbol, amend will modify the variable that is indicated by the symbol.

 v:1 2 3
 v
1 2 3
 @[v;1;3]
1 3 3
 v
1 2 3
 @[`v;1;3];
 v
1 2 3

ngn/k's amend has u as the optional argument, instead of having z as an optional argument.

@@ Line 1: / Line 1: @@
-{{primitive|@[x;y;z[;u]]}}
+{{primitive|@[x;y[;z];u]}}
 '''Amend''' is a special form of the <code>@</code> verb which takes multiple arguments.
@@ Line 6: / Line 6: @@
 * <code>x</code> is an array to amend
 * <code>y</code> is the index(or indices) to amend
-* <code>z</code> is the function to be applied to those indices
+* <code>z</code>(optional), is the function to apply to those indices
-* <code>u</code> is an extra argument if <code>z</code> takes two arguments
+* <code>u</code> is the second argument to <code>z</code>
+argument amend always acts as an element replacement function, since <code>z</code> is [[right|<code>:</code>]] if it is omitted.
 <code>x</code> can be a value or a symbol. If given a symbol, amend will modify the variable that is indicated by the symbol.
@@ Line 14: / Line 16: @@
  v
 2 3
- @[v;1;:;3]
+ @[v;1;3]
 3 3
  v
 2 3
- @[`v;1;:;3];
+ @[`v;1;3];
  v
 2 3</pre>
+== ngn/k ==
+ngn/k's amend has <code>u</code> as the optional argument, instead of having <code>z</code> as an optional argument.