# Array operations


JSON expression language allows generic array manipulation for the following functions:
+ `map` – Applies a mapping function to each element of an array and returns a new array with the transformed values.

  For example, `["map", [1, 2, 3], ["*", ["item"], 2]]` maps each element of the array `[1, 2, 3]` by multiplying it by 2.
+ `filter` – Filters an array based on a given condition and returns a new array containing only the elements that satisfy the condition

  For example, `["filter", [1, 2, 3, 4, 5], ["==", ["%", ["item"], 2], 0]]` filters the array `[1, 2, 3, 4, 5]` to include only the even numbers.
+ `reduce` – Reduces an array to a single value by applying a reducer function to each element and accumulating the result.

  For example, `["reduce", [1, 2, 3, 4, 5], ["+", ["acc"], ["item"]], 0]` reduces the array `[1, 2, 3, 4, 5]` to the sum of its elements.
+ `get` – Retrieves a value from an object or an array by specifying a key or index.

  For example, `["get", ["item"], "name"]` retrieves the value of the `"name"` property from the current item.
+ `unique` – Given an array returns only unique items inside this array.

  For example, `["unique", [1, 2, 2]]` returns `[1, 2]`.