Trying to create linear equation solver with steps in flutter-CodePudding

I was trying to create a function to expand the brackets in a linear equation. Unfortunately, I couldn't get the function to function, and I have been getting errors. Below is the code I wrote:

List openBracket(List<String> equationComponents) {
    List eqtComponents = [];
    for (int i = 0; i < equationComponents.length; i  ) {
      if (containsBracket(equationComponents.get(i))) {
        eqtComponents.addAll((equationComponents.get(i)));
      } else {
        eqtComponents.add(equationComponents.get(i));
      }
    }
    return eqtComponents;
  }

This is the error that I am facing:

"The method 'get' isn't defined for the type 'List'. Try correcting the name to the name of an existing method, or defining a method named 'get'."

I can't seem to solve the problem.

I have searched on YouTube and Google but found no solutions to the problem. I Have been trying to find alternatives to the ".get" method but to no avail.

CodePudding user response：

You can use myList.elementAt(x) or just myList[x] for list.

equationComponents.elementAt(x)

List openBracket(List<String> equationComponents) {
  List eqtComponents = [];
  for (int i = 0; i < equationComponents.length; i  ) {
    if (containsBracket(equationComponents.elementAt(i))) {
      eqtComponents.addAll([equationComponents[i]]); // add all need list 
    } else {
      eqtComponents.add(equationComponents.elementAt(i));
    }
  }
  return eqtComponents;
}

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