Using for loop inside return() function to display data in lists

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I have 2 lists as follow :

customer_id = [1,2,3,4,5]

customer_name = [John, Michael, Sara, Tony, Angel]

I need to display above data in table as different rows. I have written the code as below but its not working.

return (    
< div >   
          for(var i=0; i< customer_id.length; i++){    
          < tr>    
               < td>{customer_id[i]}< /td>    
               < td>{customer_name[i]}< /td>    
          < /tr>    
}    
< /div >    
);

I would love to know where I am wrong. Thanks.


I would write it as below using Array.map. Using .map we are here creating an array of table rows. Then App component rendering the actual table with those <tr> as table body.

import React from "react";
import ReactDOM from "react-dom";

import "./styles.css";

function TableRows({ customerIds, customerNames }) {
  return customerIds.map((id, index) => (
    <tr key={id}>
      <td>{id}</td>
      <td>{customerNames[index]}</td>
    </tr>
  ));
}

function App() {
  var customerIds = [1, 2, 3, 4, 5];
  var customerNames = ["John", "Michael", "Sara", "Tony", "Angel"];

  return (
    <table>
      <tbody>
        <TableRows customerIds={customerIds} customerNames={customerNames} />
      </tbody>
    </table>
  );
}

const rootElement = document.getElementById("root");
ReactDOM.render(<App />, rootElement);

Demo.

Loops and lists, Loops and lists. Python has great functionality for examining and manipulating such we just put all the numbers inside square brackets and separate the numbers by As we see from the list, C[3] refers to an int object with the value −5​. C.index(10) returns the index corresponding to the first element with value 10 (this  The most common use of for loops is to extract information from a list. A list, as you might know, is basically a collection of items or data. A list is essentially just one of the six different types of sequences used in Python. For this tutorial, however, we’ll focus only on two types of sequences: lists and tuples.


If you want to use a for loop, you could have an array that you push each tr to and then render the array after the loop.

class App extends React.Component {
  state = {
    customer_id: [1, 2, 3, 4, 5],
    customer_name: ["John", "Michael", "Sara", "Tony", "Angel"]
  };

  render() {
    const { customer_id, customer_name } = this.state;
    const result = [];

    for (var i = 0; i < customer_id.length; i++) {
      result.push(
        <tr key={customer_id[i]}>
          <td>{customer_id[i]}</td>
          <td>{customer_name[i]}</td>
        </tr>
      );
    }

    return <div> {result} </div>;
  }
}

ReactDOM.render(<App />, document.getElementById("root"));
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react-dom.min.js"></script>
<div id="root"></div>

ProjPython – Lists and for-loops, Storing large amounts of similar data using just one name for the list. Objective: Create a list with data and make use of that list by passing it to a function. After adding, we get 20, and assign that value to the 0th item of the list. Do not delete or in any other way prevent the clear() function from being called each time  Because for-loops are simpler and easier to read, you should use a for-loop in your code wherever the goal is to refer to the items of a list, but without changing the list. If you want to change which items the list contains, you should use a while-loop. Using range to create a list of int values. Some functions return lists.


Try structuring your data as a list of customers, having two separate lists can get messy.

var customers = [{Id:1, Name:John}, {Id:2, Name:Michael}, {Id:3, Name:Sara}, {Id:4, Name:Angel}, {Id:5, Name:Tony}]

var result = (
    {customers.map((customer, index) => (
          < tr>    
               < td>{customer.Id}< /td>    
               < td>{customer.Name}< /td>    
          < /tr>   
    ))})

return <div> {result} </div>;

see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/map for more information on the array.map function.

Tutorial: Advanced For Loops in Python – Dataquest, Then we'll dig into using for loops in tandem with common Python data science As we can see, this first lists all of the elements in x, then all elements of y. Note that, similar to lists, the range() function's count starts from 0 and not from 1. is a numpy array method – this returns a flattened version of our arrays (columns). But there’s a lot more to for loops than looping through lists, and in real-world data science work, you may want to use for loops with other data structures, including numpy arrays and pandas DataFrames. This tutorial begins with how to use for loops to iterate through common Python data structures other than lists (like tuples and dictionaries).


The Basics of Python For Loops: A Tutorial, When you're working with data in Python, for loops can be a powerful tool. Lists​, for example, are iterable and return a single list entry at a time, in the So if, for example, we rewrite our code to replace name with x , we'll get the Finally, we'll convert the range numbers to integers using Python's built-in 'int() function,  The range() Function To loop through a set of code a specified number of times, we can use the range() function, The range() function returns a sequence of numbers, starting from 0 by default, and increments by 1 (by default), and ends at a specified number.


Nested Lists and Nested Loops, If the elements of a list are themselves type list, then we call this a nested list. the list ['be', 'see', 'key', 'he'] ? def max_visits(visits_by_patient): ''' (list of list of it) -> int Return the maximum number of visits made by any paitent Suppose we can't use sum() function on a list since the point is to use a loop inside outer loop! Loops are often used to iterate and manipulate sequential data types. Nested For Loops. Loops can be nested in Python, as they can with other programming languages. A nested loop is a loop that occurs within another loop, structurally similar to nested if statements. These are constructed like so:


Collections and Looping: Lists and for – A Primer for Computational , A list, as its name implies, is a list of data (integers, floats, strings, Booleans, or even to get a sublist “slice,” and we can use the len() function to get the length of a list. An empty list is returned by calling the list() function with no parameters​. are created by enclosing a list of elements inside of parentheses, but function​  The loop functions in R are very powerful because they allow you to conduct a series of operations on data using a compact form The operation of a loop function involves iterating over an R object (e.g. a list or vector or matrix), applying a function to each element of the object, and the collating the results and returning the collated results.