How to Merge an Array of Objects Based on Unique Items in JavaScript?

Merging an Array Based on Unique Items in JavaScript

In your inquiry, you aim to merge elements from an array based on a shared unique item. You provided an example where an array of objects with cellwidth and lineNumber properties needs to be combined based on the lineNumber.

To achieve this, you can employ the following steps:

1. Initialize an empty array to store the merged result, named newCells.
2. Iterate through the totalCells array using a for loop.
3. For each element, retrieve its lineNumber.
4. Check if lineNumber exists as a property in newCells. If not, create a new object with properties for lineNumber and an empty array for cellWidth.
5. Append the cellwidth property of the current element to the cellWidth array of the object corresponding to the lineNumber.

By implementing these steps, you will create a new array (newCells) where each object represents a unique lineNumber and its cellWidth array contains all the unique cell widths associated with that line number.

<code class="javascript">var newCells = [];
for (var i = 0; i < totalCells.length; i++) {
    var lineNumber = totalCells[i].lineNumber;
    if (!newCells[lineNumber]) { // Add new object to result
        newCells[lineNumber] = {
            lineNumber: lineNumber,
            cellWidth: []
        };
    }
    // Add this cellWidth to object
    newcells[lineNumber].cellWidth.push(totalCells[i].cellWidth);
}</code>

In summary, by leveraging the provided code snippet, you can effectively merge arrays based on unique item properties, resulting in a new array with distinct line numbers and associated cell widths.

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