Tutorials

h1. Array in Scol

Arrays are helpful. Like any language, an array is a collection of elements, each identifed by an index. Its size is fixed. The access time of any element is always the same. The data type should be unchanged (like C but not like Python).

An array can be one dimensional or multi dimensional.

Note : in Scol, a string (type S) is *not* an array.

h2. What is the array type ?

This type is *tab u0*

*u0* can be any type, simple or complex. For example :

*tab S* : an array of strings

*tab [I F]* : an array of tuples

*tab [S r1]* : an array of lists

*tab [S I tab S]* : an array of tuples with a sub array

h2. How create an array ?

By the Scol function *mktab* : mktab <initial_value> <size>

h3. Example :

<pre>

typeof array = tab I;;

fun main ()=

	_showconsole;

	set array = mktab 1 10;	// size = 10, each element at 1

	0;;

</pre>

h2. How to set an element ?

By its index :

<pre>

typeof array = tab S;;

fun main ()=

	_showconsole;

	set array = mktab nil 5;

	set array.0 = "Bob";

	set array.1 = "Alice";

	set array.2 = "Uma";

	set array.3 = "Kevin";

	set array.4 = "James";

	0;;

</pre>

or, depending on the context :

<pre>

typeof array = tab S;;

fun setArray (list, index)=

	if list == nil then

		0	// done

	else

	(

		set array.index = hd list;

		setArray tl list index+1

	);;

fun main ()=

	_showconsole;

	set array = mktab nil 5;

	setArray "Bob"::"Alice"::"Uma"::"Kevin"::"Jason"::nil 0;

	0;;

</pre>

For a multidimensioanl array :

<pre>

set array[indexA][indexB] = value;

</pre>

h2. How to get an element ?

By its index :

<pre>

set myVariable = array[index];

</pre>

h2. How get the size of an array ?

By the Scol function *tabsize* : tabsize <array> or by a recursive function (see [[List in Scol]]).

h2. How to create an associative array ?

By a tuple with two elements.

For example :

<pre>

typeof array = tab [S I];;

fun main ()=

	_showconsole;

	set array = tab nil 128;

	set array.0 = ["Bob" 75];

	set array.1 = ["Alice" 25];

	...

	0;;

</pre>

- Others

The non standard library _Syspack_ provides others array functions.

License : "CC-BY-SA-2.0":https://creativecommons.org/licenses/by-sa/2.0/

Tutorial by iri

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