September 2017 Update

Task/Map-range/Jq/map-range-1.jq

@@ -0,0 +1,5 @@
+# The input is the value to be mapped.
+# The ranges, a and b, should each be an array defining the
+# left-most and right-most points of the range.
+def maprange(a; b):
+  b[0] + (((. - a[0]) * (b[1] - b[0])) / (a[1] - a[0])) ;

Task/Map-range/Jq/map-range-2.jq

@@ -0,0 +1 @@
+range(0;11) | maprange([0,10]; [-1, 0])

Task/Map-range/Jq/map-range-3.jq

@@ -0,0 +1,5 @@
+def maprange_array(a; b):
+  def _helper(a0; b0; factor): b0 + (. - a0) * factor;
+
+  a[0] as $a | b[0] as $b | ((b[1] - b[0]) / (a[1] - a[0])) as $factor
+  | map(_helper( $a; $b; $factor) );