Code not behaving same when I used localVariable with fixed number, expressionrule

Question

Hi Experts, 
 Below Block-A code line is working fine, whereas Block-B is not working even though " tointeger(index(rule!AB_getReviewKey(key: 100),"reviewkey",null()))" is returned 2. 
 Any comments please. 
 ----------------------- Block-A ------------------------- 
 a!localVariables( local!reviewkey: 2, local!excludeKeys: if( local!reviewkey = 2, { 1, 3, 4}, if(local!reviewkey = 5, { 1,3,4,5,6 }, {1,2,3 }) ), local!excludeKeys ) 
 ----------------------- Block-B ------------------------- 
 a!localVariables( local!reviewkey: tointeger(index(rule!AB_getReviewKey(key: 100),"reviewkey",null())), local!excludeKeys: if( local!reviewkey = 2, { 1, 3, 4}, if(local!reviewkey = 5, { 1,3,4,5,6 }, {1,2,3 }) ), local!excludeKeys )

Mike Schmitt · Accepted Answer

You should amend rule!AB_getReviewKey to return a single item if the expected output is always single. If it isn't, then you should use square brackets or index() when calling it in order to get a single value into your local variable. 
 Also, when posting code snippets (even short ones like this) please use a Code Box and make sure to paste indented code - it makes it much easier to read / mentally process for us. 
 a!localVariables(
 local!reviewkey: tointeger(
 index( /* use index() to get an index (1) */
 property(rule!AB_getReviewKey(key: 100), "reviewkey", null()), /* use property() to get a property (.reviewKey) */
 1,
 null()
 )
 ),
 local!excludeKeys: if(
 local!reviewkey = 2,
 { 1, 3, 4},
 if(local!reviewkey = 5, { 1,3,4,5,6 }, {1,2,3 })
 ),
 
 local!excludeKeys
)

Code not behaving same when I used localVariable with fixed number, expressionrule

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