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author | Jérémy Zurcher <jeremy@asynk.ch> | 2013-04-03 23:41:42 +0200 |
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committer | Jérémy Zurcher <jeremy@asynk.ch> | 2016-11-10 18:03:22 +0100 |
commit | dadc875c05c830d15ee0aebea70aefaea6d3e55e (patch) | |
tree | 5e86616033f1cb49749d45ecc33021b99beec97f /Scala/sandbox/curry.scala | |
parent | 1242f3e674a2dc1b2a6d4a6597c0d72d0596f469 (diff) | |
download | coursera-dadc875c05c830d15ee0aebea70aefaea6d3e55e.zip coursera-dadc875c05c830d15ee0aebea70aefaea6d3e55e.tar.gz |
Scala : rename files in sandbox
Diffstat (limited to 'Scala/sandbox/curry.scala')
-rw-r--r-- | Scala/sandbox/curry.scala | 56 |
1 files changed, 0 insertions, 56 deletions
diff --git a/Scala/sandbox/curry.scala b/Scala/sandbox/curry.scala deleted file mode 100644 index adc7e75..0000000 --- a/Scala/sandbox/curry.scala +++ /dev/null @@ -1,56 +0,0 @@ - -object Curry { - - // high order function - def sum(f: Int => Int, a: Int, b: Int) = { - def loop(a: Int, acc: Int): Int = - if (a > b) acc - else loop(a + 1, f(a) + acc) - loop(a, 0) - } - - // curry version: this function return an (Int, Int) => Int function - def sumCurry(f: Int => Int): (Int, Int) => Int = { - def sumF(a: Int, b: Int): Int = - if (a > b) 0 - else f(a) + sumF(a + 1, b) - sumF - } - - def cube (x: Int): Int = x * x * x - - def sumInts = sumCurry(x => x) - def sumCubes = sumCurry(x => x * x * x) - - // syntax shortcut - def sumCurryShort(f: Int => Int)(a: Int, b: Int): Int = - if (a > b) 0 else f(a) + sumCurryShort(f)(a + 1, b) - - // add _ if you want to treat it as a partially applied function - def sumCubesShort = sumCurryShort(cube)_ - - // product - def product(f: Int => Int)(a: Int, b: Int): Int = - if (a > b) 1 else f(a) * product(f)(a + 1, b) - - def fact(n: Int) = product(x => x)(1, n) - - // add unit value and combining function => sum and product generalisation - def mapReduce(f: Int => Int, c: (Int, Int) => Int, u: Int )(a: Int, b: Int): Int = - if (a > b) u else c(f(a), mapReduce(f, c, u)(a + 1, b)) - - def run = { - println("Curry") - println(sum(x => x * x, 3, 5)) - println(sumInts(3, 5)) - println(sumCurry(cube)(3, 5)) - println(sumCubes(3, 5)) - println(sumCurryShort(cube)(3, 5)) - println(sumCubesShort(3, 5)) - println(product(x => x * x)(3, 4)) - println(fact(4)) - println(mapReduce(x => x * x, (x, y)=> x + y, 0)(3, 5)) - println(mapReduce(x => x * x, (x, y)=> x * y, 1)(3, 4)) - } - -} |