array-mumu 0.2.0-rc.5

Array tools plugin for the Mumu ecosystem
Documentation 
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extend("test")
extend("array")

describe("array:zip", () => {

  it("truncates to shorter length for unequal int arrays and returns int2d_array", () => {
    z = array:zip([1,2,3], [10,20])
    expect_equal(type(z), "int2d_array")
    expect_equal(z, [[1,10],[2,20]])
  })

  it("preserves types for string arrays as pairs", () => {
    z = array:zip(["a","b"], ["x","y","z"])
    expect_equal(type(z), "mixed_array")
    expect_equal(z, [["a","x"], ["b","y"]])
  })

  it("supports placeholder partial for first argument", () => {
    p = array:zip(_, [9,8])
    r = p([1,2,3])
    expect_equal(type(r), "int2d_array")
    expect_equal(r, [[1,9],[2,8]])
  })

  it("supports placeholder partial for second argument", () => {
    p = array:zip([1,2], _)
    r = p([7,8,9])
    expect_equal(type(r), "int2d_array")
    expect_equal(r, [[1,7],[2,8]])
  })

  it("supports fully partial usage", () => {
    p = array:zip()
    r = p([5,6], [1,2,3])
    expect_equal(type(r), "int2d_array")
    expect_equal(r, [[5,1],[6,2]])
  })

})

describe("array:zip_with", () => {

  it("truncates to shorter length for unequal int arrays and returns mixed_array", () => {
    sum = (a,b) => a + b
    r = array:zip_with(sum, [1,2,3], [10,20])
    expect_equal(type(r), "mixed_array")
    expect_equal(array:length(r), 2)
    expect_equal(r[0], 11)
    expect_equal(r[1], 22)
  })

  it("preserves result element types with string join function", () => {
    join = (a,b) => a + "-" + b
    r = array:zip_with(join, ["a","b"], ["x","y","z"])
    expect_equal(type(r), "mixed_array")
    expect_equal(array:length(r), 2)
    expect_equal(r[0], "a-x")
    expect_equal(r[1], "b-y")
  })

  it("supports placeholder partial for function position", () => {
    p = array:zip_with(_, [1,2,3], [10,20,30])
    r = p((a,b) => a - b)
    expect_equal(type(r), "mixed_array")
    expect_equal(array:length(r), 3)
    expect_equal(r[0], -9)
    expect_equal(r[1], -18)
    expect_equal(r[2], -27)
  })

  it("supports placeholder partial for first array position", () => {
    sum = (a,b) => a + b
    p = array:zip_with(sum, _, [10,20,30])
    r = p([1,2])
    expect_equal(type(r), "mixed_array")
    expect_equal(array:length(r), 2)
    expect_equal(r[0], 11)
    expect_equal(r[1], 22)
  })

  it("supports placeholder partial for second array position", () => {
    sum = (a,b) => a + b
    p = array:zip_with(sum, [1,2,3], _)
    r = p([10,20])
    expect_equal(type(r), "mixed_array")
    expect_equal(array:length(r), 2)
    expect_equal(r[0], 11)
    expect_equal(r[1], 22)
  })

  it("supports fully partial usage", () => {
    p = array:zip_with()
    r = p((a,b) => a * b, [2,3], [5,7,9])
    expect_equal(type(r), "mixed_array")
    expect_equal(array:length(r), 2)
    expect_equal(r[0], 10)
    expect_equal(r[1], 21)
  })

})