56 lines
1.5 KiB
Fennel
56 lines
1.5 KiB
Fennel
(local { : view } (require :fennel))
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(macro expect [text actual expected]
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`(let [actual# ,actual]
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(or (match actual#
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,expected true
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_# false)
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(assert false (view {
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:text ,text
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:expected ,expected
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:actual actual#
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})))))
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(fn command [rover commands]
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(match rover.direction
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:n {:x rover.x :y (+ rover.y 1) :direction :n}
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:s {:x rover.x :y (- rover.y 1) :direction :s}
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:w {:x (- rover.x 1) :y rover.y :direction :w}
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:e {:x (+ rover.x 1) :y rover.y :direction :e}))
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(fn rover [x y direction]
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{: x
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: y
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: direction
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: command
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})
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(let [r (rover 7 15 :n)]
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(expect
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"rover knows (x,y) and the direction (N,S,E,W) it is facing"
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r
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{:x 7 :y 15 :direction :n}))
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(let [r (rover 0 0 :n)]
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(expect "The rover receives a character array of commands"
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(r:command [:f :f :f])
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{}))
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(let [r (rover 0 0 :n)]
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(expect "Moves north when pointing north and asked to move forward"
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(r:command [:f]) {:x 0 :y 1 :direction :n}))
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(let [r (rover 3 2 :s)]
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(expect "Moves south when pointing south and asked to move forward"
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(r:command [:f]) {:x 3 :y 1 :direction :s}))
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(let [r (rover 0 0 :w)]
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(expect "Moves west when pointing west and asked to move forward"
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(r:command [:f]) {:x -1 :y 0 :direction :w}))
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(let [r (rover 0 0 :e)]
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(expect "Moves east when pointing east and asked to move forward"
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(r:command [:f]) {:x 1 :y 0 :direction :e}))
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(print "OK")
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