Update multiple objects using the Javascript map() function

Question

I am trying to refactor a ReactJS component by using a map function. Is it possible to use the map() function to update multiple objects, or the same object twice? I am getting a syntax error when trying to update the initData object as follows:

days.map(day => {
      return (
        initData[`${day}From`] = myStr.slice(0, 2) 
        initData[`${day}To`] = myStr.slice(5, 7)
      );
    });

Note that I need to use return() due to React. Note that this works with one object:

days.map(day => {
      return (
        initData[`${day}From`] = myStr.slice(0, 2) 
      );
    });

It seems checking the code that you're using the wrong ' charachter. Have you tried to fix it? — Rafa Romero
– Rafa Romero, Commented Apr 18, 2018 at 10:04

Jeremy Thille · Accepted Answer · 2018-04-18 10:03:56Z

3

You're not updating day itself and not modifying the days array, so there's no point using map. Just use a for or forEach loop.

days.forEach(day => {
        initData[`${day}From`] = myStr.slice(0, 2) 
        initData[`${day}To`] = myStr.slice(5, 7)
});

answered Apr 18, 2018 at 10:03

Jeremy Thille

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