retrieve key field in dictionary from value

a!localVariables(
  local!dictionary: { txt1: 112, txt2: 113, txt3: 114, txt4: 115 },
  reject(
    fn!isnull,
    a!forEach(
      items: a!keys(local!dictionary),
      expression: a!localVariables(
        local!value: todecimal(index(local!dictionary, fv!item, null)),
        if(local!value = ri!input, fv!item, null)
      )
    )
  )
)

Hello Mathieu Drouin,

Here dictionary is the output from the query entity.

a!keys will through the following error.

Expression evaluation error at function a!keys [line 44]: The passed parameter(s) are of the wrong type. Received the type List of Variant. 

Here's a version that takes the dictionary as an input and casts it to a map.

reject(
  fn!isnull,
  a!forEach(
    items: a!keys(cast(typeof(a!map()), ri!dictionary)),
    expression: a!localVariables(
      local!value: todecimal(index(ri!dictionary, fv!item, null)),
      if(local!value = ri!input, fv!item, null)
    )
  )
)

a!localVariables(
  local!dictionary:{
    txt1:112,
    txt2:113,
    txt3:114,
    txt4:115
  },
  a!forEach(
    items:a!keys(local!dictionary),
    expression: a!localVariables(
      if(
        todecimal(index(local!dictionary, fv!item,null))=ri!input,
        fv!item,
        {}
      )
    )
  )
)