/// <summary>
/// 15.4.4.15
/// </summary>
/// <param name="target"></param>
/// <param name="parameters"></param>
/// <returns></returns>
public JsInstance IndexOfImpl(JsObject target, JsInstance[] parameters)
{
if (parameters.Length == 0)
{
return(Global.NumberClass.New(-1));
}
int len = (int)target["length"].ToNumber();
if (len == 0)
{
return(Global.NumberClass.New(-1));
}
int n = 0;
if (parameters.Length > 1)
{
n = Convert.ToInt32(parameters[1].ToNumber());
}
int k;
if (n >= len)
{
return(Global.NumberClass.New(-1));
}
JsInstance searchParameter = parameters[0];
if (n >= 0)
{
k = n;
}
else
{
k = len - Math.Abs(n);
}
while (k < len)
{
JsInstance result = null;
if (target.TryGetProperty(k.ToString(), out result))
{
if (JsInstance.StrictlyEquals(Global, result, searchParameter) == Global.BooleanClass.True)
{
return(Global.NumberClass.New(k));
}
}
k++;
}
return(Global.NumberClass.New(-1));
}
