How to apply a condition of a list of numbers

Hello friend, 

You are very close to your solution! 

the error you are receiving is due to the comparison operand. You should just be able to do: if( to integer(fv!item) < 2018, "pre", fv!item)

Furthermore, based on your output, it seems that you are doing this in an expression rule, so you'll have to return the value on it's own or as the name of the variable, please see below the code snippet: 

-- Start

local!variable: {2017, 2018, 2019, 2020}

local!variable2: a!forEach(
    items: local!variable,
    expression: if( tointeger(fv!item) < 2018, "PRE-YEAR", fv!item)
),

/*return */ 

local!variable2

-- End

If this is the value you need to return, you can go without the local variable 2 and just explicitly do the a!forEach at the end of the rule, but if it's not, that should resolve your issue! Best wishes. 

Hello friend, 

You are very close to your solution! 

the error you are receiving is due to the comparison operand. You should just be able to do: if( to integer(fv!item) < 2018, "pre", fv!item)

Furthermore, based on your output, it seems that you are doing this in an expression rule, so you'll have to return the value on it's own or as the name of the variable, please see below the code snippet: 

-- Start

local!variable: {2017, 2018, 2019, 2020}

local!variable2: a!forEach(
    items: local!variable,
    expression: if( tointeger(fv!item) < 2018, "PRE-YEAR", fv!item)
),

/*return */ 

local!variable2

-- End

If this is the value you need to return, you can go without the local variable 2 and just explicitly do the a!forEach at the end of the rule, but if it's not, that should resolve your issue! Best wishes.