使用另一个数组中的值转换所有数组键

Question

I have many arrays, generated from a csv file. Of all the arrays, the first array object is the csv header titles. See example below:

So in summary, the first array's values (ie, key = 0, and value = "report_date") should replace all the keys of the all the subsequent arrays.

So a transformation like this for all the arrays except the first.

Array[7]
"report_date": "2014-01-07"
"description": "Cupidatat reprehenderit anim non irure aliqua irure veniam sint veniam velit aute elit."
"email": "helene.pennington@techtrix.biz"
"company": "Techtrix"
"status": "false"
"name/last": "Pennington"
"name/first": "Helene"

Answer 1

You could map the result with an object and delete the first item (with just the key/key in it).

 var array = [["report_date", "description", "email", "company", "status", "name/last", "name/first"], ["2014-01-07", "Cupidatat reprehenderit anim non irure aliqua irure veniam sint veniam velit aute elit.", "helene.pennington@techtrix.biz", "Techtrix", "false", "Pennington", "Helene"]], result = array.map(function (a, _, aa) { var object = {}; aa[0].forEach(function (key, i) { object[key] = a[i]; }); return object; }).slice(1); console.log(result); 

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Answer 2

This should do the trick:

 var data = [['id', 'name', 'value'], [0, 'foo', true], [2, 'bar', false], [3, 'baz', null], [4, 'foobar', undefined] ]; var keys = data.shift(); // Get the first row, containing the keys var result = data.map(function(row) { var current = {}; // Create a new element for (var i = 0; i < keys.length; i++) { current[keys[i]] = row[i]; // Map the current row to keys on the new element } return current; // Return the new element, to be used in the result. }); console.log(result); 

Keep in mind that shift modifies the source array. The data variable does get edited as a result of this function.

Answer 3

One other way of solving your problem is as follows;

 var data = [["prop_0", "prop_1", "prop_2"], ["val_00", "val_01", "val_02"], ["val_10", "val_11", "val_12"], ["val_20", "val_21", "val_22"]], newData = data.slice(1) .map(vs => vs.reduce((p,c,i) => i-1 ? Object.assign(p,{[data[0][i]]: c}) : Object.assign({},{[data[0][i-1]]: p, [data[0][i]]: c}))); console.log(newData);