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I have been searching for the correct regex for converting this string to JSON. It works if there is a single object in the array, but I believe the comma is messing it up somehow.
const json = "{\"userId\":44, \"userName\": \"Jim Coleman\"},{\"userId\":33515, \"userName\": \"Grace Mamaradlo\"}";
const obj = JSON.parse(json.replace(/("[^"]*"\s*:\s*)(\d{17,})/g, '$1"$2"'));
console.log(obj);
There was nothing wrong except that the list of objects was not contained within square brackets
const json = "{\"userId\":44, \"userName\": \"Jim Coleman\"},{\"userId\":33515, \"userName\": \"Grace Mamaradlo\"}";
console.log(JSON.parse(`[${json}]`))
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I want to remove First and Last Quotes from this array Using JavaScript:
"["Morning Shift","Day Shift"]"
After Remove quotes output look like this
["Morning Shift","Day Shift"]
You can try using JSON.parse():
The JSON.parse() method parses a JSON string, constructing the JavaScript value or object described by the string.
Demo:
var data = `["Morning Shift","Day Shift"]`;
data = JSON.parse(data);
console.log(data);
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I am working with an array in Javascript that contains several IDs in them but I would like to filter out all non-numeric entries using regex and return that array of just numbers. For example, I have myArray = ['131125150138677','CI%20UW%20SYSTEMS%20S','040964100010832'] where I want to get rid of the second item in the list since it's non-numeric.
So use Filter and test to see if they are numbers
var myArray = ['131125150138677', 'CI%20UW%20SYSTEMS%20S', '040964100010832']
var filtered = myArray.filter(Number)
console.log(filtered)
var filtered2 = myArray.filter(s => s.match(/^\d+$/))
console.log(filtered2)
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Convert
var a = [['12ae11ee12-1bhb222','2019-10-10T19:46.19.632z','a123']]
to
var a= ['12ae11ee12-1bhb222','2019-10-10T19:46.19.632z','a123']
I dont want two square brackets in front and end.
I want output
a[2] = 'a123'
The best way to do is just assigning the first value to the array:
var a = [['12ae11ee12-1bhb222','2019-10-10T19:46.19.632z','a123']];
a = a[0];
console.log(a);
But the right way of dealing it should be making sure that the endpoint or whatever that outputs should output correctly.
You can use Array.prototype.flat().
console.log([['12ae11ee12-1bhb222','2019-10-10T19:46.19.632z','a123']].flat());
This solution works if it's extremely nested too:
console.log([
['12ae11ee12-1bhb222'],
['2019-10-10T19:46.19.632z', 'a123']
].flat());
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I am drawing trails on a map and the coordinates of the trail are saved as string in a json file in the following format:
(43.886758784865066, 24.226741790771484),(43.90271630763887, 24.234981536865234)
I need to get these values and add them to an array:
coordinates= [43.886758784865066, 24.226741790771484,43.90271630763887, 24.234981536865234];
So how can I do this transition?
You can try that way
var string = '(43.886758784865066, 24.226741790771484),(43.90271630763887, 24.234981536865234)';
string.match(/\d+(\.\d+)/g).map(function(d){return d;});
You could just use regular expressions to parse those strings.
const match = string.match(/\((.*)\, (.*)\),\((.*)\, (.*)\)/)
/*
Matches
["(43.886758784865066, 24.226741790771484),(43.90271630763887, 24.234981536865234)", "43.886758784865066", "24.226741790771484", "43.90271630763887", "24.234981536865234"]
*/
const Array.prototype.slice.call(match).splice(1, 4)
/* Converts to array and takes the last three elements
["43.886758784865066", "24.226741790771484", "43.90271630763887", "24.234981536865234"]
*/
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I have a json web service that returns simply [].
Then, I have a javascript Object variable json_var that contains this json output. When json returns empty [], json_var is undefined. How do I check from the content of json_var that the json output is empty []?
check for the length of the response. As it was mentioned [] refers to an empty array
var test = [];
console.log(test.length); // returns 0
JSFIDDLE