JS比较和修改数组中的嵌套数组项

Question

What is the correct / best practice way to perform the following?

I have an array that contains a dynamic number of arrays within it. Each nested array is built like so: (the values change obviously)

["100",{"value":"0.10","amount":"6000"}]

In some of the nested arrays, the first item ("100" in the example) repeats itself. In such case, I would like to add the second item (the key-value pairs) to the nested array.

Example:

Original Array-

[
["631",{"value":"0.10","amount":"6000"}],
["100",{"value":"0.20","amount":"5000"}],
["631",{"value":"0.30","amount":"7000"}]
]

Desired Output-

[
["631",{"value":"0.10","amount":"6000"}, {"value":"0.30","amount":"7000"}],
["100",{"value":"0.20","amount":"5000"}]
]

I've thought about iterating through the original array and then performing an if comparison but couldn't reach the exact desired output format. Any help? Thanks in advance.

Answer 1

I did use one for and one conditional if

 data = [ ["631",{"value":"0.10","amount":"6000"}], ["100",{"value":"0.20","amount":"5000"}], ["631",{"value":"0.30","amount":"7000"}] ] result = []; for (key in data) { var index =result.findIndex((item) => item[0] === data[key][0]) if(index<0){ result.push(data[key]) } else { result[index].push(data[key][1]) } } console.log(result)