Evaluate a single Javascript expression.
qjs_eval(eval_string)
The result of the provided expression
# Return the sum of two numbers:
qjs_eval("1 + 2")
#> [1] 3
# Concatenate strings:
qjs_eval("'1' + '2'")
#> [1] "12"
# Create lists from objects:
qjs_eval("var t = {'a' : 1, 'b' : 2}; t")
#> $a
#> [1] 1
#>
#> $b
#> [1] 2
#>