Increment a counter up and down in marimo.

back-forth.py

import marimo

__generated_with = "0.11.30"
app = marimo.App(width="medium")


@app.cell
def _():
    import marimo as mo
    return (mo,)


@app.cell
def _(mo):
    max_count = 5
    get_count, set_count = mo.state(0)
    return get_count, max_count, set_count


@app.cell
def _(get_count):
    get_count()
    return


@app.cell
def _(get_count, max_count, mo, set_count):
    mo.ui.array(
        [
            mo.ui.button(
                on_click=lambda _: set_count((get_count() - 1) % max_count), label="prev"
            ),
            mo.ui.button(
                on_click=lambda _: set_count((get_count() + 1) % max_count), label="next"
            ),
        ]
    )
    return


@app.cell
def _():
    return


if __name__ == "__main__":
    app.run()