NgRx is 40x faster than your code – find out why

When I started using @ngrx/store to hold collections of information, I usually put the data into the store as a JavaScript array. It seemed to be the simplest and most appropriate data structure for the information. However, when @ngrx/entity came out, I saw that it used a different pattern – instead of using the array directly, it converts the array to two data structures; an array of ids and an object map keyed by those ids. Why did they do this? And is there a lesson we can learn for our own code?

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Transposing Rows and Columns in ag-grid

Real-world Angular applications often need to present tabular/grid data, and most grids make the most sense when presented with each column representing a certain type of data. For example, on a spreadsheet showing a pay schedule for a loan, the first column could be a date, the second column could be the interest accrued, the next could be the size of the payment, etc.

However, we sometimes need to show data in a transposed format, where the rows instead of the columns need to show a consistent data type. This is a rare case, which is why some major grid libraries like ag-grid don’t provide native support for the feature, but it’s still necessary.

Fortunately, ag-grid gives enough power to developers to be able to transpose data for display, and even to have features like renderers and editors apply by row instead of by column.

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