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I'm trying to take an array of integers and cast it to bytes in JavaScript but can't quite figure out how to do it.
The input would look something like [2,-76,7,2,8,69,82,88,87,2,52,50,...].
If I was going to do it in another language like Java I'd use something like the following.
byte[] bytArr = new byte[intArray.size()];
for (int i = 0; i < intArray.size(); i++) {
bytArr[i] = (byte) intArray[i];
}
I'm pretty new to JS so not sure if this is even possible...
You can use Int8Array, which is a typed array.
const arr = Int8Array.from([2,-76,7,2,8,69,82,88,87,2,52,50]);
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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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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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Trying to generate a set of strings such as 'TCP', 'DNS' or 'SQL'
I want to be able to have these strings set and be able to have them appear randomly like you would with random numbers.
You can make an array and select them randomly:
const strings = ['TCP', 'DNS', 'SQL'];
for (var i = 0; i < 5; i++) {
console.log(`Random string: ${strings[Math.floor(Math.random() * strings.length)]}`);
}
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[1,2,3,4,5,6] should be changed to set containing {1,2},{2,3},{3,4},{4,5},{5,6} using normal for loop and using javascript map and reduce functions convert array to set of pairs using different techniques Thanks in Advance
Why not a simple for loop? Array functions are great but are often unnecessary.
const arr = [1,2,3,4,5,6]
const result = []
for (let i = 1; i < arr.length; ++i)
result.push([arr[i-1], arr[i]])
console.log(result)
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I am getting below line in my source file and I would like to sum those values separated by pipe ("|")
There is no limit for the values coming in the line (might be 100 values)
10|20|30|40|[no limit for values] - Separator is pipe "|"
The ouptput would be 100
Please help to write a javascript function for the above query.
Regards
Jay
You should take a look at JavaScript's built-in functions: With split you can split your string into an array, with reduce you can 'reduce' your array to a single value, in that case via summation. These two links should provide you enough information for building your code.
You could try something like below:
function sum(value){
var total = 0;
var array = value.split(",").map(Number);
for( var i = 0; i < array.length; i++) {
total += array[i];
}
alert(total);
}
var value = "10|20|30|40".replace(/\|/g, ',');
console.log(sum(value));
https://jsfiddle.net/f7uqw7cL/