Obtain a list of X characters from a nested array

When working with JavaScript, what is the most effective method for extracting all the X values from a multi-dimensional array and storing them in a new array? I am aiming to utilize either reduce or map if feasible. Is there a specific term used to describe this process, akin to a mathematical operation?

[{x:0,y:8,z:-1}, {x:1, y:8.5, z:-0.5}, {x:2, y:9, z:0}]

Additionally, how can this be achieved using the following data structure (preferably) :

[[0,8,-1], [1, 8.5, -0.5], [2, 9, 0]]

My goal is to isolate the x values:

[0,1,2]
javascriptarraysmultidimensional-array

Answer №1

Here's a simple script for you to understand easily!

var arr = [{x:0, y:8, z:-1}, {x:1, y:8.5, z:-0.5}, {x:2, y:9, z:0}];
var array = [];
for (var i = 0; i < arr.length; i++) {
    for (var key in arr[i]) {
        array.push(arr[i][key]);
        break;
    }
}
console.log(array);

Answer №2

    const coordinates = [[0,8,-1], [1, 8.5, -0.5], [2, 9, 0]];
    const xCoordinates = coordinates.reduce( (accumulator, value) => {accumulator.push(value[0]); return accumulator}, []);
    // xCoordinates array now holds [0,1,2]

Each element in the points array is processed using the reduce method to extract and store the x-coordinates (v[0]) into a new array.

There are multiple approaches for achieving this task, with one simpler option being to use the Array.prototype.map function:

    const xCoordinates = coordinates.map( (value) => value[0])

The mathematical operation could be described as "projecting onto the x-axis," although different perspectives might exist among mathematicians.

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