How can I convert tabular row data to column data in javascript

Question

so I need to convert an array that contains tabular row data into column data in a specific format so I can use it to display a chart with Recharts.

My data is in the following format:

rows = [
    ['Year', '2010', '2011', '2012', '2013'], 
    ['wages','2000','2000','2050','2050'], 
    ['purchase cost', '4000', '4300', '4500', '5000']
]

I need the data to be formatted as follows:

columns = [
    {'Year' : '2010', 'wages' : '2000', 'purchase cost' : '4000'}, 
    {'Year' : '2011', 'wages' : '2000', 'purchase cost' : '4300'}, 
    {'Year' : '2012', 'wages' : '2050', 'purchase cost' : '4500'}, 
    {'Year' : '2013', 'wages' : '2050', 'purchase cost' : '5000'}
]

I've gotten close to getting the result I need but can't seem to get it to work, so I would appreciate any help with this!

Answer 1

Keep two principles

1. The subarrays are all the same length.
2. The first element of the subarray is the column name.

I implemented it in several steps, you can refer to the following code.

 const rows = [ ['Year', '2010', '2011', '2012', '2013'], ['wages', '2000', '2000', '2050', '2050'], ['purchase cost', '4000', '4300', '4500', '5000'] ]; const property = rows.map(row => row[0]); const columns = rows.map(row => { row.shift(); return row }); const data = columns.map((column, i) => { return column.map(col => { const obj = {}; obj[property[i]] = col; return obj; }); }); const result = new Array(columns[0].length); for (let i = 0; i < result.length; i++) { const obj = {}; for (let j = 0; j < property.length; j++) { for (const [key, value] of Object.entries(data[j][i])) { obj[key] = value; } } result[i] = obj; } console.log(result);