What is the best way to dynamically display or load an array containing only two values?

Question

What is the best way to dynamically display or load an array containing only two values?

Hi, I'm new to Java Script and ReactJS, and I'm currently working on a project to enhance my skills. One of the tasks in this project involves rendering polygonal points on a map using the google-maps-react library.

However, I encountered an issue with the format of the coordinates required by the library for plotting polygons. The data format that I have is different from what is expected by the library:

[
  [
    [-47.7027099655629, -22.26485424139211],
    [-47.70271526762656, -22.26487408404245],
    [-47.70272860122938, -22.26486817968162],
    [-47.70275769033151, -22.26485486960603],
    [-47.7027803963492, -22.26483968832534],
    [-47.7027099655629, -22.26485424139211]
  ]
], [
  [
    [-47.70336262481528, -22.26561084941619],
    [-47.70336542334331, -22.26561213882109],
    [-47.70336596593334, -22.26561211173161],
    [-47.7033695288571, -22.2656092720629],
    [-47.70337969579747, -22.26560034650085],
    [-47.70336262481528, -22.26561084941619]
  ]
]

I'm looking for a JavaScript function or method that can help me transform my coordinate array into the correct format expected by the google-maps-react library. The desired output should look like this:

const coords = {
  coords: [
    [
      { lat: -47.7027099655629, lng: -22.26485424139211 },
      { lat: -47.70271526762656, lng: -22.26487408404245 },
      { lat: -47.70275769033151, lng: -22.26485486960603 },
      { lat: -47.7027803963492, lng: -22.26483968832534 },
      { lat: -47.7027099655629, lng: -22.26485424139211 },
    ],
    [
      { lat: -47.70336262481528, lng: -22.26561084941619 },
      { lat: -47.70336542334331, lng: -22.26561213882109 },
      { lat: -47.70336596593334, lng: -22.26561211173161 },
      { lat: -47.70337969579747, lng: -22.26560034650085 },
      { lat: -47.70336262481528, lng: -22.26561084941619 },
    ],
  ],
};

With almost eight thousand lines of data, manually converting each coordinate is not feasible. So, I am seeking a solution to automate this process.

You can find the original data file I am attempting to use here:

Thank you for your help!

javascript google-maps-react

Answer 1

Answer №1

To process an array of arrays, you can utilize the reduce function in conjunction with the map function to generate the desired result.

let arr = [  [    [      [-47.7027099655629, -22.26485424139211],      [-47.70271526762656, -22.26487408404245],      [-47.70272860122938, -22.26486817968162],      [-47.70275769033151, -22.26485486960603],      [-47.7027803963492, -22.26483968832534],      [-47.7027099655629, -22.26485424139211]    ]  ], [    [      [-47.70336262481528, -22.26561084941619],      [-47.70336542334331, -22.26561213882109],      [-47.70336596593334, -22.26561211173161],      [-47.7033695288571, -22.2656092720629],      [-47.70337969579747, -22.26560034650085],      [-47.70336262481528, -22.26561084941619]    ]  ]];
let coords = {
  coords: arr.reduce((a, [c]) => a.concat([c.map(([lat, lng]) => ({lat, lng}))]), [])
};

console.log(coords);

.as-console-wrapper { max-height: 100% !important; top: 0; }

Answer 2

To process an array of arrays, you can utilize the reduce function in conjunction with the map function to generate the desired result.

let arr = [  [    [      [-47.7027099655629, -22.26485424139211],      [-47.70271526762656, -22.26487408404245],      [-47.70272860122938, -22.26486817968162],      [-47.70275769033151, -22.26485486960603],      [-47.7027803963492, -22.26483968832534],      [-47.7027099655629, -22.26485424139211]    ]  ], [    [      [-47.70336262481528, -22.26561084941619],      [-47.70336542334331, -22.26561213882109],      [-47.70336596593334, -22.26561211173161],      [-47.7033695288571, -22.2656092720629],      [-47.70337969579747, -22.26560034650085],      [-47.70336262481528, -22.26561084941619]    ]  ]];
let coords = {
  coords: arr.reduce((a, [c]) => a.concat([c.map(([lat, lng]) => ({lat, lng}))]), [])
};

console.log(coords);

.as-console-wrapper { max-height: 100% !important; top: 0; }

Answer 3

Answer №2

To properly organize and manipulate the data, you will need to use a loop function. Since you are working with multiple arrays, it would be best to utilize a reduce function.

If you are unfamiliar with how a reduce function works, I recommend checking out this resource first: https://www.w3schools.com/jsref/jsref_reduce.asp

Essentially, the process involves iterating through each element and modifying the values as needed. Below is a simple example, which can be adjusted according to your specific requirements:

const newCoordinates = coordinates.reduce((acc, curr) => {
  const newCoordiantes = curr[0].map((coord) => ({
    lat: coord[0],
    lng: coord[1]
  }));
  acc.push([newCoordiantes]);
  return acc;
}, []);

For a demonstration of how this works, you can refer to this live example: https://codesandbox.io/s/sharp-cloud-nfx4k?file=/src/index.js

Answer 4

To properly organize and manipulate the data, you will need to use a loop function. Since you are working with multiple arrays, it would be best to utilize a reduce function.

If you are unfamiliar with how a reduce function works, I recommend checking out this resource first: https://www.w3schools.com/jsref/jsref_reduce.asp

Essentially, the process involves iterating through each element and modifying the values as needed. Below is a simple example, which can be adjusted according to your specific requirements:

const newCoordinates = coordinates.reduce((acc, curr) => {
  const newCoordiantes = curr[0].map((coord) => ({
    lat: coord[0],
    lng: coord[1]
  }));
  acc.push([newCoordiantes]);
  return acc;
}, []);

For a demonstration of how this works, you can refer to this live example: https://codesandbox.io/s/sharp-cloud-nfx4k?file=/src/index.js

Answer 5

Answer №3

To modify the format of your array with nested arrays and convert [lat, lng] to { lat, lng }, as well as flatten out a single sub-element layer, you can utilize the map method in JavaScript. This involves cascading two map calls, one of which implicitly destructures the single-element array. Here's an example implementation:

const convert = arr => arr.map(([group]) => group.map(([lat, lng]) => ({ lat, lng })))

const inputData = [[[[-47.7027099655629,-22.26485424139211],[-47.70271526762656,-22.26487408404245],[-47.70272860122938,-22.26486817968162],[-47.70275769033151,-22.26485486960603],[-47.7027803963492,-22.26483968832534],[-47.7027099655629,-22.26485424139211]]],[[[-47.70336262481528,-22.26561084941619],[-47.70336542334331,-22.26561213882109],[-47.70336596593334,-22.26561211173161],[-47.7033695288571,-22.2656092720629],...console-wrapper { max-height: 100% !important; top: 0; }

Please note that the structure of your input data may require adjustment, as it appears to be missing an outer array encompassing the multiple arrays shown. I have included this correction in my example for the code to function correctly.

Answer 6

To modify the format of your array with nested arrays and convert [lat, lng] to { lat, lng }, as well as flatten out a single sub-element layer, you can utilize the map method in JavaScript. This involves cascading two map calls, one of which implicitly destructures the single-element array. Here's an example implementation:

const convert = arr => arr.map(([group]) => group.map(([lat, lng]) => ({ lat, lng })))

const inputData = [[[[-47.7027099655629,-22.26485424139211],[-47.70271526762656,-22.26487408404245],[-47.70272860122938,-22.26486817968162],[-47.70275769033151,-22.26485486960603],[-47.7027803963492,-22.26483968832534],[-47.7027099655629,-22.26485424139211]]],[[[-47.70336262481528,-22.26561084941619],[-47.70336542334331,-22.26561213882109],[-47.70336596593334,-22.26561211173161],[-47.7033695288571,-22.2656092720629],...console-wrapper { max-height: 100% !important; top: 0; }

Please note that the structure of your input data may require adjustment, as it appears to be missing an outer array encompassing the multiple arrays shown. I have included this correction in my example for the code to function correctly.

What is the best way to dynamically display or load an array containing only two values?

Answer №1

Answer №2

Answer №3

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