Javascript-用新项目替换数组/对象中的项目

Question

There are two arrays.

data = [["hi","0"],["hello","1"],["world","2"]]

dataNumbers = ["0","2","1"]

How can I replace the 0,1,2 in data with the values in dataNumbers?

After replacement,

data = [["hi","0"],["hello","2"],["world","1"]]

And in here,

{"data":[["hi","0"],["hello","1"],["world","2"]],"dataNumbers":["0","2","1"]}

How do I replace them the numbers in data with dataNumbers?

After replacement,

{"data":[["hi","0"],["hello","2"],["world","1"]],"dataNumbers":["0","2","1"]}

Answer 1

Trying to achieve something like this?

 var data = [ ["hi", "0"], ["hello", "1"], ["world", "2"] ]; var dataNumbers = ["0", "2", "1"]; const IDX_DESIRED_NUM = 1; for (var i = 0; i < data.length; i++) { data[i][IDX_DESIRED_NUM] = dataNumbers[i]; } console.log(data); 

Answer 2

Do you want something like this:

 var data = [["hi","0"],["hello","1"],["world","2"]]; var dataNumbers = ["0","2","1"] for(var i=0;i<data.length;i++){ data[i][1]=dataNumbers; } console.log(data); 

Answer 3

You can use the map() function for both of these cases.

 let data = [["hi","0"],["hello","1"],["world","2"]]; let dataNumbers = ["0","2","1"]; let newData = data.map(function(item,index){ item[1] = dataNumbers[index]; return item; }); console.log(newData); let obj = {"data":[["hi","0"],["hello","1"],["world","2"]],"dataNumbers":["0","2","1"]}; obj.data = obj.data.map(function(item,index){ item[1] = obj.dataNumbers[index]; return item; }); console.log(obj); 

Answer 4

You could iterate the target array and assign the value of source array at the same index.

 var object = { data: [["hi", "0"], ["hello", "1"], ["world", "2"]], dataNumbers: ["0", "2", "1"] }; object.data.forEach((a, i) => a[1] = object.dataNumbers[i]); console.log(object); 

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