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The operators above may be used in augmented form with normal assignment (i.e., x1 op:= x2; short for x1 := x1 op x2) . Many of these are common and natural, such as any of the mathematical group, concatenation, and comparisons for sorting. And the most common uses will be building results inside loops or scanning operations. Some of the examples include:

while x1 *:= x2 # product

while S1 ++= S2 # builds a set/cset

Some others are less obvious, such as:

Others are obscure or even a bit baffling, such as:

s1 ==:= s2 # ensures arguments are both strings (assigns but no value change)

n1 =:= n2 # numeric version of above