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To download and build rainbow and open a REPL: git clone git://github.com/conanite/rainbow.git cd rainbow ant ant # yes, twice. The second time uses rainbow to generate optimisations of itself cd src/arc java -server -jar rainbow.jar Make sure you have ant installed, including the optional libraries. On ubuntu or similar, sudo apt-get install ant ant-optional On macosx, ant comes with the Developer Tools. Rainbow comes with a small number of sample apps that demonstrate how to access java from arc. Welder, an arc IDE: arc> (welder "rainbow/welder.arc") A filesystem browser that opens files in welder arc> (fsb) Play tetris: arc> (tetris) Play minesweeper: arc> (mines) A web application that plots z <- z^2 + c, the Mandelbrot formula: arc> (start-spiral-app) Run all tests: arc> (rat) passed: 409 failed: 0 Run benchmark suite: arc> (rbs) You should see a report at the end resembling this: avg min max arc-code-indexer 201.845 173 353 find-top-numbers 63.815 61 78 generate-primes 31.105 30 37 read-arc-dot-arc-content 33.195 29 90 sort-random-numbers 90.66 84 121 string-tokeniser 89.6 83 152 Profile invocation counts and times for a function: arc> (profiler (repeat 5 (tokens (rand-string 1000) #\0))) Rainbow command-line options: -f file1 ... fileN # evaluate each file -e '(arc axpr)' # evaluate arc expr (after having evaluated -f, if specified) -args a b c # sets "*argv*" in the arc environment to (a b c). This option, if present, must be specified last. -q # no REPL --no-libs # don't load any arc libraries. Not even arc.arc.