QGIS/resources/function_help/json/array_slice

{
  "name": "array_slice",
  "type": "function",
  "groups": ["Arrays"],
  "description": "Returns a portion of the array. The slice is defined by the start_pos and end_pos arguments.",
  "arguments": [{
    "arg": "array",
    "description": "an array"
  }, {
    "arg": "start_pos",
    "description": "the index of the start position of the slice (0 based). The start_pos index is included in the slice. If you use a negative start_pos, the index is counted from the end of the list (-1 based)."
  }, {
    "arg": "end_pos",
    "description": "the index of the end position of the slice (0 based). The end_pos index is included in the slice. If you use a negative end_pos, the index is counted from the end of the list (-1 based)."
  }],
  "examples": [{
    "expression": "array_slice(array(1,2,3,4,5),0,3)",
    "returns": "[ 1, 2, 3, 4 ]"
  }, {
    "expression": "array_slice(array(1,2,3,4,5),0,-1)",
    "returns": "[ 1, 2, 3, 4, 5 ]"
  }, {
    "expression": "array_slice(array(1,2,3,4,5),-5,-1)",
    "returns": "[ 1, 2, 3, 4, 5 ]"
  }, {
    "expression": "array_slice(array(1,2,3,4,5),0,0)",
    "returns": "[ 1 ]"
  }, {
    "expression": "array_slice(array(1,2,3,4,5),-2,-1)",
    "returns": "[ 4, 5 ]"
  }, {
    "expression": "array_slice(array(1,2,3,4,5),-1,-1)",
    "returns": "[ 5 ]"
  }, {
    "expression": "array_slice(array('Dufour','Valmiera','Chugiak','Brighton'),1,2)",
    "returns": "[ 'Valmiera', 'Chugiak' ]"
  }, {
    "expression": "array_slice(array('Dufour','Valmiera','Chugiak','Brighton'),-2,-1)",
    "returns": "[ 'Chugiak', 'Brighton' ]"
  }],
  "tags": ["array", "defined", "arguments", "start", "position", "slice", "portion", "end", "index"]
}