Add Link A Scalar To An Array as a Zsh TIL

zsh/link-a-scalar-to-an-array.md

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+# Link A Scalar To An Array
+
+`Zsh` has a builtin command `typeset` that does a variety of things. When given
+the `-T` flag and the names of a scalar and an array, it will link them
+together so that a change to one is reflected in the other.
+
+The scalar is a string of values delimited by a colon (`:`). The array is an
+array that can be interacted with using array operations like append (`+=`).
+
+```bash
+$ typeset -T FOO foo
+
+$ echo $FOO
+
+
+$ export FOO="one:two"
+
+$ echo $foo
+one two
+
+$ foo+=three
+
+$ echo $FOO
+one:two:three
+```
+
+Notice `FOO` is initially empty. I then `export` it to overwrite it with two
+values delimited by a colon. Since `foo` is automatically kept in sync, I can
+`echo $foo` and see those values displayed as an array. I can then append a
+third value using an array operation on `foo`. The update will be automatically
+reflected in `FOO`.
+
+`Zsh` does this under the hood for `PATH` and `path` which is why you can [add
+to the path via the path array](add-to-the-path-via-path-array.md).
+
+See `man zshbuiltins` for more details.
+
+[source](http://devlib.symbian.slions.net/s3/GUID-D87C96CE-3F23-552D-927C-B6A1D61691BF.html)