× TypeError: Cannot read properties of undefined (reading ‘map’)

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× TypeError: Cannot read properties of undefined (reading ‘map’)

  1. × TypeError: Cannot read properties of undefined (reading 'map')

    I had the same error and solved it by first asking if the array existed.
    Example:
    <Filter> { product.color?.map((c) => ( <FilterColor color = {c} key = {c} /> ))}; </Filter>

  2. × TypeError: Cannot read properties of undefined (reading 'map')

    I had the same error and solved it by first asking if the array existed.
    Example:
    <Filter> { product.color?.map((c) => ( <FilterColor color = {c} key = {c} /> ))}; </Filter>

Solution 1

I had the same error and solved it by first asking if the array existed.

Example:

<Filter>
  { product.color?.map((c) => (
    <FilterColor color = {c} key = {c} />
  ))};
</Filter>

Original Author jake Of This Content

Solution 2

There is a property “products” in your component. That variable has higher priority than the map you have outside, and your .map is using it. I would recommend to rename one of them, to avoid variables with the same name.

Given the error, I would guess that that property wasn’t passed to the component.

Also, the parameter of the map lambda is “products” too. Change it to “product”, or it will fail.

Original Author Iván Of This Content

Solution 3

The properties, products, that you’re passing to your component (Products) are undefined. The Map method is taking in account the products that you have passed as properties is not the one that you have created outside the component itself.

If you want to map out the products array that you created outside of your components then just change its name as the array has the same name as the properties passed. If you want to use the products (from the property) then make sure that you’re passing the properties in the component.

Original Author Abdullah Ch Of This Content

Solution 4

It’s because you have taken the array “products” and the map item “products” by the same name. Change the map item to something else like “product”:

const products = [
        {id: 1, name: 'Shoes', description: 'Running Shoes.' },
        {id: 2, name: 'MacBook', description: 'Apple MacBook.' },
    ];

const Products = ({ products }) => {
  const classes = useStyles();

  return (
    <main className={classes.content}>
      <div className={classes.toolbar} />
      <Grid container justify="center" spacing={4}>
        {products.map((product) => (
          <Grid item key={product.id} item xs={12} sm={6} md={4} lg={3}>
            <Product/>
          </Grid>
        ))};
      </Grid>
    </main>
  );
};

Original Author Dawood Ahmad Of This Content

Conclusion

So This is all About This Tutorial. Hope This Tutorial Helped You. Thank You.

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Siddharth

I am an Information Technology Engineer. I have Completed my MCA And I have 4 Year Plus Experience, I am a web developer with knowledge of multiple back-end platforms Like PHP, Node.js, Python and frontend JavaScript frameworks Like Angular, React, and Vue.

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