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How to get the index of a particular value/entry in a list?

I have the following list, how do I get the index of SplPparameter?

myList = {paramter1, parameter2, parameter3, Splparameter, parameterN, parameterEnd};

Ans is 4  in the above example. 

ScriptingRe: How to get the index of a particular value/entry in a list?

Here are a couple of ways to handle your question.

Names Default To Here( 1 );
// My solution when list items are expressions
myList = {paramter1, parameter2, parameter3, Splparameter, parameterN, parameterEnd};

For( i = 1, i <= N Items( mylist ), i++,
 If( myList[i] == Parse( "Splparameter" ),
  Break()
 )
);
Show( i );

// If elements are strings the contains can be used
myList = {"paramter1", "parameter2", "parameter3", "Splparameter", "parameterN", "parameterEnd"};
i = Contains( myList, "Splparameter" );

Re: How to get the index of a particular value/entry in a list?

In the case of expressions, you can also use 'Loc()' (which returns a column vector):

Names Default To Here( 1 );

myList = {paramter1, parameter2, parameter3, Splparameter, parameterN, parameterEnd, Splparameter};
Print(loc(mylist, NameExpr(Splparameter)));