zeropad.coffee

test-zeropad.coffee

exports.run = ->
    describe("utils.zeroPad", ->
        zeroPad = utils.zeroPad

        it("should have zeroPad", ->
            should.exist(utils.zeroPad)
            should.exist(zeroPad)
        )   

        it("should be a function", ->
            expect(typeof(zeroPad)).to.equal("function")
        )   

        it("should not pad 1 digit", ->
            input = 1 
            expect(zeroPad(input, 1)).to.equal("1")
        )   

        it("should pad to 2 digits", ->
            input = 2 
            expect(zeroPad(input, 2)).to.equal("02")
        )   

        it("should pad to 3 digits", ->
            input = 57
            expect(zeroPad(input, 3)).to.equal("057")
        )   

        it("should pad to 4 digits", ->
            input = 81
            expect(zeroPad(input, 4)).to.equal("0081")
        )   

        it("should pad to 10 digits", ->
            input = 1 
            expect(zeroPad(input, 10)).to.equal("0000000001")
        )   
    )

zeropad.coffee

zeroPad = (num, numZeros) ->
    n = Math.abs(num)
    zeros = Math.max(0, numZeros - Math.floor(n).toString().length)
    zeroString = Math.pow(10, zeros).toString().substr(1)

    if num < 0 
        zeroString = "-" + zeroString

    zeroString + n 
exports.zeroPad = zeroPad