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ViewsConvert an arrays of array surrounded by quotes into string array
I have date duration values in following format.
array1 = '[["2022-01-18","2022-01-21"],["2022-02-15","2022-02-17"], ...]';
And need to convert it as follows,
array2 = [ '2022-01-18 - 2022-01-21', '2022-02-15 - 2022-02-17', ... ]
For the work done I have followed two ways,
formattedArray1 = array1.replace(/","/g, " - ").reduce((a, b) => a.concat(b), [])
this gives me an error:
array2.reduce is not a function
formattedArray2 = [].concat.apply([], array1.replace(/","/g, " - "));and this gives me the error
CreateListFromArrayLike called on non-object
To fix this any thought would be highly appreciated!
3 answers
Answer question0
What you've got there is an array serialised to JSON.
You can parse it to an array then map it to the value you want
const array1 = '[["2022-01-18","2022-01-21"],["2022-02-15","2022-02-17"]]';
const arr = JSON.parse(array1);
const array2 = arr.map(([from, to]) => `${from} - ${to}`);
console.log(array2);If you're curious (like I was) about the performance of the template literal vs Array.prototype.join(), the results from https://jsbench.me are below...
Template literal
2678.21 ops/s ± 0.85%
Fastest
Array.prototype.join()
1150.62 ops/s ± 0.51%
57.04 % slower
0
array1 is stored as String, so you need to convert it to Array to use reduce or other array methods.
array1 = '[["2022-01-18","2022-01-21"],["2022-02-15","2022-02-17"]]';
arr = JSON.parse(array1)
formattedArray1 = arr.map((e) => e.join(" - "))
// ['2022-01-18 - 2022-01-21', '2022-02-15 - 2022-02-17']
0
- You are calling reduce on type string(
array1.replace(/","/g, " - ")will return a string) , reduce works only withArray.prototypethat's why you are gettingreduceis not a function.
array2.reduce is not a function error.
You need to parse the array before doing reduce.
const array1 = '[["2022-01-18","2022-01-21"],["2022-02-15","2022-02-17"]]';
const parsedArr = JSON.parse(array1);
const result = parsedArr.map(date => date.join(" - ") )
console.log(result)