I'm currently tackling a coding task that involves receiving a text input from the user in a specific format like shown below:
value = "[1, 2, 3, 4]\n[9, 8, 7, 6]\n[1, 2, 3, 4]";When using .split, the value is transformed into an array as follows:
value = ["[1, 2, 3, 4]", "[9, 8, 7, 6]", "[1, 2, 3, 4]"];Now, the challenge is how to convert those strings back into actual arrays?
Utilize the combination of map and JSON.parse functions to process the split string:
var data = "[5, 6, 7, 8]\n[3, 9, 2, 5]\n[5, 6, 7, 8]";
data = data.split("\n");
var arraysData = data.map(d => JSON.parse(d));
console.log(arraysData);Swap out the \ns for commas and wrap the input in [ and ]. This will create a JSON representation of one array containing 3 subarrays:
const value = "[1, 2, 3, 4]\n[9, 8, 7, 6]\n[1, 2, 3, 4]";
const json = '[' + value.replace(/\n/g, ',') + ']';
const arr = JSON.parse(json);
console.log(arr);Just a single pair of square brackets stands between you and successfully parsing your data as JSON.
try {
let list = JSON.parse('[' + data + ']');
} catch(error) {}
Using try/catch is wise when the input format may change unexpectedly.
After implementing the code as shown below:
value = ["[1, 2, 3, 4]", "[9, 8, 7, 6]", "[1, 2, 3, 4]"];You can utilize this method to extract the actual arrays:
value.map(e => e.slice(1, -1).split(',').map(Number))This approach will yield an array containing all your arrays.
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