This topic describes the syntax of list functions and provides parameter description and function examples.

Functions

Type Function Description
List processing lst_make Constructs a list.
lst_insert Inserts values to a list at a specified position.
lst_append Adds values to the end of a list.
lst_delete_at Deletes a value from a list at a specified position.
lst_reverse Reverses the order of values in a list.
op_slice Obtains values at specified positions from a list.

lst_make

  • Syntax 
    lst_make(Value 1, Value 2, ...)
  • Parameters
    Parameter Type Required? Description
    Value 1 Any type Yes The value used to construct the list.
    Value 2 Any type Yes The value used to construct the list.
  • Response

    The constructed list is returned.

  • Examples
    Processing rule: 
    e_set("hello", lst_make("k1","k2"))
    Processing result: 
    hello: ["k1","k2"]

lst_insert

  • Syntax 
    lst_insert(List, Position, Value 1, Value 2, ...)
  • Parameters
    Parameter Type Required? Description
    List List Yes The list to which you want to insert the values.
    Position Number Yes The position where you want to insert the values.
    Value 1 Any type Yes The value to insert.
    Value 2 Any type No The value to insert.
  • Response

    The updated list is returned.

  • Examples
    Raw log: 
    ctx: ["k1","k2"]
    Processing rule: 
    e_set("hello", lst_insert(v("ctx"), 0, "k0"))
    Processing result: 
    ctx: ["k1","k2"]
hello: ["k0", "k1", "k2"]

lst_append

  • Syntax 
    lst_append(List, Value 1, Value 2, ...)
  • Parameters
    Parameter Type Required? Description
    List List Yes The list to which you want to append the values.
    Value 1 Any type Yes The value to add.
    Value 2 Any type No The value to add.
  • Response

    The updated list is returned.

  • Examples
    Raw log: 
    ctx: ["k1","k2"]
    Processing rule: 
    e_set("hello", lst_append(v(ctx), "k3"))
    Processing result: 
    ctx: ["k1","k2"]
hello: ["k1", "k2", "k3"]

lst_delete_at

  • Syntax 
    lst_delete_at(List, Position)
  • Parameters
    Parameter Type Required? Description
    List List Yes The list from which you want to delete the value.
    Position Number Yes The position of the value to delete. The position of the first value is 0.
  • Response

    The updated list is returned.

  • Examples
    Raw log: 
    ctx: ["k1","k2"]
    Processing rule: 
    e_set("hello", lst_delete_at(v("ctx"),1))
    Processing result: 
    ctx: ["k1","k2"]
hello: ["k1"]

lst_reverse

  • Syntax 
    lst_reverse(List)
  • Parameters
    Parameter Type Required? Description
    List List Yes The list for which you want to reverse the order of values.
  • Response

    The updated list is returned.

  • Examples
    Raw log: 
    ctx: ["v1","v2"]
    Processing rule: 
    e_set("hello", lst_reverse(v("ctx")))
    Processing result: 
    ctx: ["v1","v2"]
hello: ["v2","v1"]