Kee,
I can spend hours on why merge is useful and underappreciated but I will
boil it down to one use case only: templates.
Merge is crucial if you're assembling some textual template that is not
LiveCode but want to generate parts of it in LiveCode. For example, the
first step in understanding the power of merge is "variable
interpolation" in which we use merge to place values inside our text,
for example, consider the following HTML snippet:
----
<ul>
<li>Name: [[tFirstName]]</li>
<li>Surname: [[tSurname]]</li>
<li>Email: [[tEmail]]</li>
</ul>
---
Calling merge and having those variables filled with the data you want
will get you the HTML you want. You can extrapolate it further by
calling functions from merge such as:
---
<p>The current time is: [[the long english date]]</p>
---
You can even do loops and assemble more stuff. This is way better than
error prone string concatenation. It is good for generating all sorts of
textual formats, from HTML/XML to more niche stuff such as scripts to
run in another language or even in LC itself.
Cheers
andre
On 18/01/2019 18:33, kee nethery via use-livecode wrote:
I’m confused. Can someone explain why merge function exists when the put
function works just as well?
merge( [[ 1 + 2 ]] = 3)
vs
put 1 + 2 && “= 3”
What is it that merge can do that a put cannot do? Just asking because I don’t
want LiveCode to end up like Perl where there are so many completely different
ways to do the exact same thing that one person’s perl code can be unreadable
to another equally talented Perl coder.
Kee
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