TryCF Gist

trycf-gist-1651917768496-6f4332fa-21a7-5a9b-bcba-11be9eb737b8.cfm

<cfscript>
function testRest(first, ...rest) {
    return arguments
}


function run() {
    describe("Testing CF's rest operator, eg: function testRest(first, ...rest)", () => {
        describe("Expected behaviour", () => {
            it("combines all latter argument values into one parameter value when using positional arguments", () => {
                actual = testRest("first", "second", "third", "fourth")
                expect(actual).toBe([
                    first = "first",
                    rest = ["second", "third", "fourth"]
                ])
                
                 writeDump(var=actual, label="actual/expected")
            })
            it("combines all latter argument values into one parameter value when using named arguments", () => {
                actual = testRest(first="first", two="second", three="third", four="fourth")
                expect(actual.first).toBe("first")
                expect(actual).toHaveKey("rest")
                expect(actual.rest).toBe({two="second", three="third", four="fourth"})
            })
        })
        
        describe("Actual behaviour", () => {
            it("doesn't work at all with named arguments", () => {
                actual = testRest(first="first", two="second", three="third", four="fourth")
                expect(actual.first).toBe("first")
                expect(actual?.rest).toBeNull()
                expect(actual.keyList().listSort("TEXTNOCASE")).toBe("FIRST,four,REST,three,two")
                
                 writeDump(var=actual, label="actual")
                 writeDump(var={first="first", rest={two="second", three="third", four="fourth"}}, label="expected")
            })
            
            it("mishandles specifying a named argument `rest`", () => {
                actual = testRest(first="first", rest="rest", two="second", three="third", four="fourth")
                expect(actual.first).toBe("first")
                expect(actual.rest).toBe("rest")
                
                expected = {
                    first = "first",
                    rest = "rest",
                    two = "second",
                    three = "third",
                    four = "fourth"
                }
                expected.each((k, v) => {
                    expect(actual[k]).toBe(v)
                })

                 writeDump(var=actual, label="actual")
                 writeDump(var={first="first", rest={rest="rest", two="second", three="third", four="fourth"}}, label="expected") 
             })
        })
    })
}

tinyTest.runTests()
</cfscript>