How to Combine JavaScript Arrays into Unique Objects Based on a Specific Property?

Combining Arrays in JavaScript: A Guide to Merging by Unique Elements

In JavaScript, combining arrays can be a convenient way to consolidate data. However, when the goal is to merge arrays based on unique elements, a different approach is required.

Problem Statement:

You have an array of objects, each containing a cellWidth and lineNumber property. The task is to combine these objects into an array with each unique lineNumber representing a new object, grouping the corresponding cellWidth values into an array within that object.

Solution:

To achieve this combination, you can utilize a JavaScript object as an intermediary. The following steps outline the process:

1. Initialize an empty result array:

<code class="javascript">var newCells = [];</code>

2. Iterate through the input array:

<code class="javascript">for (var i = 0; i < totalCells.length; i++) {</code>

3. Extract the lineNumber property:

<code class="javascript">var lineNumber = totalCells[i].lineNumber;</code>

4. Check if the lineNumber exists in the result array:

<code class="javascript">if (!newCells[lineNumber]) {</code>

5. If it doesn't exist, add a new object to the result array:

<code class="javascript">newCells[lineNumber] = {
    lineNumber: lineNumber,
    cellWidth: []
};</code>

6. Push the cellWidth value to the object's array:

<code class="javascript">newcells[lineNumber].cellWidth.push(totalCells[i].cellWidth);</code>

By following these steps, you can effectively combine the arrays based on unique lineNumber values, resulting in an array of objects that group cell widths by line number.

The above is the detailed content of How to Combine JavaScript Arrays into Unique Objects Based on a Specific Property?. For more information, please follow other related articles on the PHP Chinese website!