identificar se posição de array existe

Código:


if (variable_local_exists("nome_da_var[index]"))
{
//code
}


The following functions exist that allow you to check whether certain variables exist and with which you can set variables and get their values. In all these functions the variable name is passed as a string!


variable_global_exists(name) Returns whether a global variable with the given name (a string) exists.
variable_local_exists(name) Returns whether a local variable with the given name (a string) exists for the current instance.
variable_global_get(name) Returns the value of the global variable with the given name (a string).
variable_global_array_get(name,ind) Returns the value of index ind of the global array variable with the given name (a string).
variable_global_array2_get(name,ind1,ind2) Returns the value of index ind1,ind2 of the global 2-dimensional array variable with the given name (a string).
variable_local_get(name) Returns the value of the local variable with the given name (a string).
variable_local_array_get(name,ind) Returns the value of index ind of the local array variable with the given name (a string).
variable_local_array2_get(name,ind1,ind2) Returns the value of index ind1,ind2 of the local 2-dimensional array variable with the given name (a string).
variable_global_set(name,value) Sets the global variable with the given name (a string) to the given value.
variable_global_array_set(name,ind,value) Sets the index ind in the global array variable with the given name (a string) to the given value.
variable_global_array2_set(name,ind1,ind2,value) Sets the index ind1,ind2 in the global 2-dimensional array variable with the given name (a string) to the given value.
variable_local_set(name,value) Sets the local variable with the given name (a string) to the given value.
variable_local_array_set(name,ind,value) Sets the index ind in the local array variable with the given name (a string) to the given value.
variable_local_array2_set(name,ind1,ind2,value) Sets the index ind1,ind2 in the local 2-dimensional array variable with the given name (a string) to the given value.

For example, you can write:


{
if variable_global_exists('ammunition')
global.ammunition += 1
else
global.ammunition = 0
}

You can also use these functions to pass variables to a script in a sort of by-reference way, by passing their names as strings and using the functions to change them.

Código:

Um objeto persistente:

@create:
mygrid = ds_grid_create(2,2); //note que a sintaxe é (largura,altura) ou seja, o OPOSTO da ordem das arrays na criação.
fileira = 0;
coluna = 0;
ds_grid_set(mygrid,fileira,coluna,10);
current_value = ds_grid_get(mygrid,fileira,coluna); //note que aqui é igual às arrays

@game_end:
ds_grid_destroy(minhaGrid);

@draw
draw_text(50,50