| Expression | Value after rendering | (let ((anchor "An anchor text")
(url "http://www.cs.auc.dk")
(tag a)
)
(tag 'href url anchor)) | An anchor text | (let ((f b))
(let ((f em)
(g f))
(p (f "Text 1") (g "Text 2")))) | Text 1 Text 2 | (let ((phrase-elements
(list em strong dfn code samp
kbd var cite abbr acronym))
)
(ul
(map
(lambda (f) (li (f "foo")))
phrase-elements))) | - foo
- foo
- foo
foo- foo
- foo
- foo
- foo
- foo
- foo
|
| | Examples of namebindings with let. The first example shows that all constituents of a function call can be bound
to local names - in the example both the function object referred to by a,
and two string parameters. The second example illustrates that alternative names, aliases, can be
defined for a couple of functions.
Notice in particular that g is bound to b (the bold face function), not em (the emphasis function).
This can also be seen in the second column. The third example is a little more advanced, and it can first be understood fully on the
ground of the material in the lecture about higher-order functions.
We bind the name phrase-elements to a list of ten functions. Via mapping,
we apply each function to foo, and we present the results in an ul list. |
