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Runtime evaluation/In an environment: Difference between revisions
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Line 108:
<lang e>? evalWithX(e`(x :float64).exp()`, 0, 1)
# value: 1.7182818284590455</lang>
=={{header|Erlang}}==
<lang Erlang>
-module( runtime_evaluation ).
-export( [task/0] ).
task() ->
Form = form_from_string( "X." ),
Variable1 = evaluate_form( Form, {'X', 1} ),
io:fwrite( "~p~n", [Variable1] ),
Variable2 = evaluate_form( Form, {'X', 2} ),
io:fwrite( "~p~n", [Variable2] ),
io:fwrite( "~p~n", [Variable2 - Variable1] ).
evaluate_form( Form, {Variable_name, Value} ) ->
Bindings = erl_eval:add_binding( Variable_name, Value, erl_eval:new_bindings() ),
{value, Evaluation, _} = erl_eval:expr( Form, Bindings ),
Evaluation.
form_from_string( String ) ->
{ok, Tokens, _} = erl_scan:string( String ),
{ok, [Form]} = erl_parse:parse_exprs( Tokens ),
Form.
</lang>
{{out}}
<pre>
14> runtime_evaluation:task().
1
2
1
</pre>
=={{header|Forth}}==
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