how to add item in list of maps

Question

Hello, 
 
 i have a list of maps, 
 how do you add new map value? 
 and 
 how do you update an index of repective value map? 
 
 this is the rule code (but it do not work): 
 
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 a!localVariables( local!campos: a!forEach( items: ri!map, expression: fv!item.sistema = ri!sistema ), local!indice: where(local!campos,-1), local!resultado:if( local!indice > 0, if( a!isNullOrEmpty(ri!permiso), remove(ri!map,local!indice), /*update value in list*/ a!update(ri!map,local!indice,a!map(sistema: ri!sistema,permiso:ri!permiso)) ), /*add map to list*/ a!update(ri!map,length(ri!map)+1,a!map(sistema: ri!sistema,permiso:ri!permiso)) ), local!resultado ) 
 
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Sanchit Gupta (Xebia) · Answer

Your logic for updating an index in a list of Map seems to be fine, for adding a map to list you can simply use append() function. 
 Take reference from the sample code snippet. 
 a!localVariables(
 local!map: {
 a!map(name: "Test", class: 10),
 a!map(name: "Test1", class: 10),
 a!map(name: "Test2", class: 10),
 a!map(name: "Test3", class: 10)
 },
 local!update: a!update(
 local!map,
 { 1, 2 },
 {
 a!map(name: "TEst100", class: 12),
 a!map(name: "TEst200", class: 11)
 }
 ),
 local!add: append(
 local!map,
 {
 a!map(name: "Test5", class: 12),
 a!map(name: "Test6", class: 12)
 }
 ),
 local!add
)