Cannot iterate over states

[lusty bane]

const [finishedFlags, setFinishedFlags] = React.useState<boolean[]>(() => steps.map(() => false));

const completedMainSteps = () => {
    return finishedFlags.filter(flag => flag).length;
};

[frail thorn]

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[lusty bane]

gives me TypeError: finishedFlags.filter is not a function

however when I had: const finishedFlags = React.useState<boolean[]>(() => steps.map(() => false)); the same code works.

when doing: console.log(finishedFlags) I get: Array(6) [ false, false, false, false, false, false]. But for whatever reason I cannot perform a simple .ForEach on it, nor can I iterate over it with a simple for loop as it claims to be "not iteratable"?