Tables (Arrays)
Tables are very useful. They can be used to store any type of value, even including
functions or other tables.
Tables Array คือรูปแบบมิติของข้อมูลที่สร้างขึ้น ใช้เครื่องหมาย { } หรือ ปีกกา เปิด - ปิด
การสร้างอาร์เรย์ (Array)
Creating Tables
There are generally two ways to create a table from scratch. The first
braces to specify a list of values:
my_table = {"apple","orange","peach"};
associative_table = {fruit="apple", vegetable="carr
my_table = {};
my_table[1] = "apple";
my_table[2] = "orange";
my_table[3] = "peach";
associative_table = {};
associative_table.fruit = "apple";
associative_table.vegetable = "carrot";
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Accessing Table Elements
Each “record” of information stored in a table is known as an element. Each element
consists of a key, which serves as the index into the table, and a value that is
associated with that key.
There are generally two ways to access an element: you can use array notation, or dot
notation. Array notation is typically used with numeric arrays, which are simply tables
where all of the keys are numbers. Dot notation is typically used with associative
arrays, which are tables where the keys are strings.
Here is an example of array notation:
t = {"one", "two", "three"};
Dialog.Message("Element one contains:", t[1]);
Here is an example of dot notation:
t = {first="one", second="two", third="three"};
Dialog.Message("Element 'first' contains:", t.first);
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อาร์เรย์ แบ่งออกเป็นชนิดต่างๆ ดังนี้
1. Numeric Arrays
One of the most common uses of tables is as arrays. An array is a collection of val
that are indexed by numeric keys. In the scripting engine, numeric arrays are one-
based. That is, they start at index 1.
Here are some examples using numeric arrays:
Example 1:
myArray = {255,0,255};
Dialog.Message("First Number", myArray[1]);
This first example would display a dialog message containing the number “255.”
Example 2:
alphabet = {"a","b","c","d","e","f","g","h","i","j","k",
"l","m","n","o","p","q","r","s","t","u","v","w","x","y","
Dialog.Message("Seventh Letter", alphabet[7]);
This would display a dialog message containing the letter “g.”
Example 3:
myArray = {};
myArray[1] = "Option One";
myArray[2] = "Option Two";
myArray[3] = "Option Three";
This is exactly the same as the following:
myArray = {"Option One", "Option Two", "Option Three"};
2. Associative Arrays
Associative arrays are the same as numeric arrays except that the indexes can be
numbers, strings or even functions.
Here is an example of an associative array that uses a last name as an index and a first
name as the value:
arrNames = {Anderson="Jason",
Clemens="Roger",
Contreras="Jose",
Hammond="Chris",
Hitchcock="Alfred"};
Dialog.Message("Anderson's First Name", arrNames.Anderson);
Here is an example of a simple employee database that keeps track of employee
names and birth dates indexed by employee numbers:
Employees = {}; -- Construct an empty table for the employee numbers
-- store each employee's information in its own table
Employee1 = {Name="Jason Anderson", Birthday="07/02/82"};
Employee2 = {Name="Roger Clemens", Birthday="12/25/79"};
-- store each employee's information table
-- at the appropriate number in the Employees table
Employees[100099] = Employee1;
Employees[137637] = Employee2;
-- now typing "Employees[100099]" is the same as typing "Employee1"
Dialog.Message("Birthday",Employees[100099].Birthday);
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Using For to Enumerate Tables
There is a special version of the for statement that allows you to quickly and easily
enumerate the contents of an array. The syntax is:
for index,value in table do
operate on index and value
end
For example:
mytable = {"One","Two","Three"};
-- display a message for every table item
for j,k in mytable do
Dialog.Message("Table Item", j .. "=" .. k);
end
If you just want the indexes of a table, you can leave out the value part of the for
statement:
a = {One=1, Two=2, Three=3};
for k in a do
Dialog.Message("Table Index", k);
end
The above script will display three message boxes in a row, with the text “One,”
“Three,” and then “Two.”
Whoa there—why aren’t the table elements in order? The reason for this is that
internally the scripting engine doesn’t store tables as arrays, but in a super-efficient
structure known as a hash table. The important thing to know is that when you define
table elements, they are not necessarily stored in the order that you define or add
them, unless you use a numeric array (i.e. a table indexed with numbers from 1 to
whatever).
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Copying Tables
Copying tables is a bit different from copying other types of values. Unlike variables,
you can't just use the assignment operator to copy the contents of one table into
another. This is because the name of a table actually refers to an address in memory
where the data within the table is stored. If you try to copy one table to another using
the assignment operator, you end up copying the address, and not the actual data.
For example, if you wanted to copy a table, and then modify the copy, you might try
something like this:
table_one = { mood="Happy", temperature="Warm" };
-- create a copy
table_two = table_one;
-- modify the copy
table_two.temperature = "Cold";
Dialog.Message("Table one temperature is:", table_one.temperature);
Dialog.Message("Table two temperature is:", table_two.temperature);
Luckily, the for statement makes this really easy to do. For example, here’s a modified
version of our earlier example, that creates a “true” copy of table_one.
table_one = { mood="Happy", temperature="Warm" };
-- create a copy
table_two = {};
for index, value in table_one do
table_two[index] = value;
end
-- modify the copy
table_two.temperature = "Cold";
Dialog.Message("Table one temperature is:", table_one.temperature);
Dialog.Message("Table two temperature is:", table_two.temperature);
This time, the dialogs show that modifying table_two doesn’t affect table_one at all:
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Table Actions
There are a number of table-related actions at your disposal, which you can use to do
such things as inserting elements into a table, removing elements from a table, and
counting the number of elements in a table. For more information on these actions,
please see Program Reference / Actions / Table in the online help.
หัวข้อ: การเขียน Script Action Wizard & Plugin ใน AutoPlay Media Studio 7, 8 (ภาค3) (อ่าน 9707 ครั้ง) 
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