00eb17014a
While doing this, I also discovered that there is also a reference to lists in numbers, but that might a bit easier for someone to grasp, given the hint that the koan gives, and the output they see when they run it.
95 lines
2.2 KiB
Elixir
95 lines
2.2 KiB
Elixir
defmodule Numbers do
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require Integer
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use Koans
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@intro "Why is the number six so scared? Because seven eight nine!\nWe should get to know numbers a bit more!"
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koan "Are you odd?" do
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assert Integer.is_odd(3) == ___
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end
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koan "Actually you might be even" do
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assert Integer.is_even(4) == ___
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end
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koan "Let's grab the individual digits in a list" do
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individual_digits = Integer.digits(58127)
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assert individual_digits == ___
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end
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koan "Oh no! I need it back together" do
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number = Integer.undigits([1, 2, 3, 4])
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assert number == ___
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end
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koan "Actually I want my number as a string" do
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string_digit = Integer.to_string(1234)
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assert string_digit == ___
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end
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koan "The meaning of life in hexidecimal is 2A!" do
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assert Integer.parse("2A", 16) == {___, ""}
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end
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koan "The remaining unparsable part is also returned" do
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assert Integer.parse("5 years") == {5, ___}
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end
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koan "What if you parse a floating point value as an integer?" do
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assert Integer.parse("1.2") == {___, ___}
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end
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koan "Just want to parse to a float" do
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assert Float.parse("34.5") == {___, ""}
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end
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koan "Hmm, I want to parse this but it has some strings" do
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assert Float.parse("1.5 million dollars") == {___, " million dollars"}
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end
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koan "I don't want this decimal point, let's round up" do
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assert Float.ceil(34.25) == ___
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end
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koan "OK, I only want it to 1 decimal place" do
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assert Float.ceil(34.25, 1) == ___
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end
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koan "Rounding down is what I need" do
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assert Float.floor(99.99) == ___
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end
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koan "Rounding down to 2 decimal places" do
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assert Float.floor(12.345, 2) == ___
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end
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koan "Round the number up or down for me" do
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assert Float.round(5.5) == ___
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assert Float.round(5.4) == ___
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assert Float.round(8.94, 1) == ___
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assert Float.round(-5.5674, 3) == ___
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end
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koan "I want the first and last in the range" do
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first..last = Range.new(1, 10)
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assert first == ___
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assert last == ___
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end
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koan "Does my number exist in the range?" do
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range = Range.new(1, 10)
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assert 4 in range == ___
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assert 10 in range == ___
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assert 0 in range == ___
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end
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koan "Is this a range?" do
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assert Range.range?(1..10) == ___
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assert Range.range?(0) == ___
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end
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end
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