/// <summary>
/// Creates a new instance of <see cref="FunctionExpression" /> based on an existing one, and adds statements to it.
/// </summary>
/// <param name="expression">The instance of <see cref="FunctionExpression" /> to copy the <see cref="FunctionExpression.Name" /> and <see cref="FunctionExpression.Parameters" /> from.</param>
/// <param name="statements">A sequence of statements to add to the body of the function.</param>
/// <returns>a new instance of <see cref="FunctionExpression" />.</returns>
public static FunctionExpression Do(this FunctionExpression expression, IEnumerable <Statement> statements)
{
if (expression == null)
{
throw new ArgumentNullException("expression");
}
return(new FunctionExpression(expression.Name, expression.Parameters, new CompoundStatement(statements)));
}
/// <summary>
/// Creates a new instance of <see cref="FunctionExpression" /> based on an existing one, and adds parameters to it.
/// </summary>
/// <param name="expression">The instance of <see cref="FunctionExpression" /> to copy the <see cref="FunctionExpression.Name" /> and <see cref="FunctionExpression.Body" /> from.</param>
/// <param name="identifiers">A sequence of parameters to add to the new instance.</param>
/// <returns>a new instance of <see cref="FunctionExpression" />.</returns>
public static FunctionExpression Parameters(this FunctionExpression expression, IEnumerable <IdentifierExpression> identifiers)
{
if (expression == null)
{
throw new ArgumentNullException("expression");
}
return(new FunctionExpression(expression.Name, identifiers, expression.Body));
}