array.map() function
The array.map() function is experimental and subject to change at any time.
By using this function, you accept the risks of experimental functions.
array.map() iterates over an array, applies a function to each element to
produce a new element, and then returns a new array.
import "experimental/array"
array.map(
arr: [1, 2, 3, 4],
fn: (x) => x * 2,
)
// Returns [2, 4, 6, 8]
Parameters
arr
Array to operate on. Default is the piped-forward array (<-).
fn
Function to apply to elements. The element is represented by x in the function.
Examples
Convert an array of integers to an array of records
import "experimental/array"
a = [1, 2, 3, 4, 5]
b = a |> array.map(fn: (x) => ({_value: x}))
// b returns [{_value: 1}, {_value: 2}, {_value: 3}, {_value: 4}, {_value: 5}]
// Output the array of records as a table
> array.from(rows: b)
Iterate over and modify an array of records
a =
[
{a: 1, b: 2, c: 3},
{a: 4, b: 5, c: 6},
{a: 7, b: 8, c: 9},
]
b = a |> array.map(fn: (x) => ({x with a: x.a * x.a, d: x.b + x.c}))
// b returns:
// [
// {a: 1, b: 2, c: 3, d: 5},
// {a: 16, b: 5, c: 6, d: 11},
// {a: 49, b: 8, c: 9, d: 17}
// ]
// Output the modified array of records as a table
array.from(rows: b)
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