September 2017 Update

Task/Arrays/Jq/arrays.jq

@@ -0,0 +1,36 @@
+# Create a new array with length 0
+[]
+
+# Create a new array of 5 nulls
+[][4] = null   # setting the element at offset 4 expands the array
+
+# Create an array having the elements 1 and 2 in that order
+[1,2]
+
+# Create an array of integers from 0 to 10 inclusive
+[ range(0; 11) ]
+
+# If a is an array (of any length), update it so that a[2] is 5
+a[2] = 5;
+
+# Append arrays a and b
+a + b
+
+# Append an element, e, to an array a
+a + [e]
+
+##################################################
+# In the following, a is assumed to be [0,1,2,3,4]
+
+# It is not an error to use an out-of-range index:
+a[10]  # => null
+
+# Negative indices count backwards from after the last element:
+a[-1]  # => 4
+
+# jq supports simple slice operations but
+# only in the forward direction:
+a[:1]  # => [0]
+a[1:]  # => [1,2,3,4]
+a[2:4] # => [2,3]
+a[4:2] # null