function solve(eq){
    console.log(Array.isArray(eq));
    let ops;
    let op;
    let calc;
    while(eq.length>1){
        ops = getOps(eq);
        op  = highestPriority(ops);
        calc = calculate(eq[op[1]],eq[op[1]-1],eq[op[1]+1]);
        eq = reduceExpr(eq,op[1],calc)
    }
    return eq;

The error is triggering on the line: while(eq.length>1){
I checked:
Array.isArray(eq) yields a true log, so it is not that eq does not have a length attribute.
I earlier also used console.log(eq.length) and got 3 (my expected output)
Also checked the element types : all are string type

I have read a few articles on debugging the TypeErrors but none of the solutions seemed relevant previously checked.

For the curious this is a part of a basic calculator exercise I am building.

Anyone have any ideas on what else I can check?