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local _ = require "mason-core.functional"
describe("functional: table", function()
it("retrieves property of table", function()
assert.equals("hello", _.prop("a", { a = "hello" }))
end)
it("retrieves nested property of table", function()
assert.equals("hello", _.path({ "a", "greeting" }, { a = { greeting = "hello" } }))
end)
it("picks properties of table", function()
local function fn() end
assert.same(
{
["key1"] = 1,
[fn] = 2,
},
_.pick({ "key1", fn }, {
["key1"] = 1,
[fn] = 2,
[3] = 3,
})
)
end)
it("converts table to pairs", function()
assert.same(
_.sort_by(_.nth(1), {
{
"skies",
"cloudy",
},
{
"temperature",
"20°",
},
}),
_.sort_by(_.nth(1), _.to_pairs { skies = "cloudy", temperature = "20°" })
)
end)
it("converts pairs to table", function()
assert.same(
{ skies = "cloudy", temperature = "20°" },
_.from_pairs {
{
"skies",
"cloudy",
},
{
"temperature",
"20°",
},
}
)
end)
it("should invert tables", function()
assert.same(
{
val1 = "key1",
val2 = "key2",
},
_.invert {
key1 = "val1",
key2 = "val2",
}
)
end)
it("should evolve table", function()
assert.same(
{
non_existent = nil,
firstname = "JOHN",
lastname = "DOE",
age = 42,
},
_.evolve({
non_existent = _.always "hello",
firstname = _.to_upper,
lastname = _.to_upper,
age = _.add(2),
}, {
firstname = "John",
lastname = "Doe",
age = 40,
})
)
end)
it("should merge left", function()
assert.same(
{
firstname = "John",
lastname = "Doe",
},
_.merge_left({
firstname = "John",
}, {
firstname = "Jane",
lastname = "Doe",
})
)
end)
it("should dissoc keys", function()
assert.same({
a = "a",
c = "c",
}, _.dissoc("b", { a = "a", b = "b", c = "c" }))
end)
it("should assoc keys", function()
assert.same({
a = "a",
b = "b",
c = "c",
}, _.assoc("b", "b", { a = "a", c = "c" }))
end)
end)
describe("table immutability", function()
it("should not mutate tables", function()
local og_table = setmetatable({ key = "value", imagination = "poor", hotel = "trivago" }, {
__newindex = function()
error "Tried to newindex"
end,
})
_.prop("hotel", og_table)
_.path({ "hotel" }, og_table)
_.pick({ "hotel" }, og_table)
_.keys(og_table)
_.size(og_table)
_.from_pairs(_.to_pairs(og_table))
_.invert(og_table)
_.evolve({ hotel = _.to_upper }, og_table)
_.merge_left(og_table, {})
_.assoc("new", "value", og_table)
_.dissoc("hotel", og_table)
assert.same({ key = "value", imagination = "poor", hotel = "trivago" }, og_table)
end)
end)
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