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How to parse string value "(20)" to Integer in Javascript?

I'm working with a string "(20)". I need to convert it to an int. I read parseInt is a function which helps me to achieve that, but i don't know how.

Use string slicing and parseInt()
var str = "(20)"
str = str.slice(1, -1) // remove parenthesis
var integer = parseInt(str) // make it an integer
console.log(integer) // 20
One Line version
var integer = parseInt("(20)".slice(1, -1))
The slice method slices the string by the start and end index, start is 1, because that’s the (, end is -1, which means the last one - ), therefore the () will be stripped. Then parseInt() turns it into an integer.
Or use regex so it can work with other cases, credits to #adeithe
var integer = parseInt("(20)".match(/\d+/g))
It will match the digits and make it an integer
Read more:
slicing strings
regex

You can use regex to achieve this
var str = "(20)"
parseInt(str.match(/\d+/g).join())

Easy, use this
var number = parseInt((string).substr(2,3));

You need to extract that number first, you can use the match method and a regex \d wich means "digits". Then you can parse that number
let str = "(20)";
console.log(parseInt(str.match(/\d+/)));

Cleaner version of Hedy's
var str = "(20)";
var str_as_integer = parseInt(str.slice(1, -1))

How to turn all integers in an array into a single number? [duplicate]

How do I join this array to give me expected output in as few steps as possible?
var x = [31,31,3,1]
//expected output: x = 313131;

Use array join method.Join joins the elements of an array into a string, and returns the string. The default separator is comma (,). Here the separator should be an empty string.
var x = [31,31,3,1].join("");
EDIT: To get the result as numeric
const x = +[31,31,3,1].join("");
or
const x = Number([31,31,3,1].join(""));

Javascript join() will give you the expected output as string. If you want it as a number, do this:
var x = [31,31,3,1];
var xAsString = x.join(''); // Results in a string
var xAsNumber = Number(x.join('')); // Results in a number, you can also use +(x.join(''))

I can't think of anything other than
+Function.call.apply(String.prototype.concat, x)
or, if you insist
+''.concat.apply('', x)
In ES6:
+''.concat(...x)
Using reduce:
+x.reduce((a, b) => a + b, '');
Or if you prefer
x.reduce(Function.call.bind(String.prototype.concat), '')
Another idea is to manipulate the array as a string, always a good approach.
+String.prototype.replace.call(x, /,/g, '')
There may be other ways. Perhaps a Google search on "join array javascript" would turn up some obscure function which joins elements of an array.

Your question asks for a number, most of the answers above are going to give you a string. You want something like this.
const number = Number([31,31,3,1].join(""));

Try join() as follows
var x = [31,31,3,1]
var y = x.join('');
alert(y);

Try below.
var x = [31,31,3,1]
var teststring = x.join("");

This will work
var x = [31,31,3,1];
var result = x.join("");

Parse a string representing an array of floats

I have a string as such:
string = "[x,y,z]"
Where x, y and z are valid javascript floats as strings. Some examples:
-0.9999
1.
1.00000000000E-5
-1E5
What is the most efficient (fastest) way to parse this string into an actual javascript array of floats without using Eval?
Now I do this:
parseFloatArray = function(string){
// isolate string by removing square brackets
string = string.substr( 1, string.length-2 )
// create array with string split
var array = string.split(',');
// parse each element in array to a float
for (var i = 0, il = array.length; i < il; i++){
array[i] = parseFloat(array[i]);
}
// return the result
return array
}
It is important that the solution works correctly for the above examples.
I also tried with JSON.parse which seemed perfect at first, but it returns a SyntaxError for the second example 1. where there is nothing following the decimal separator.
I prepared a fiddle for testing.

Instead of this
array[i] = parseFloat(array[i]);
try
array[i] = +array[i];
Above handles all the test cases pretty well.
Here is the working fiddle

Try this :
str = "[-0.9999, 1., 1.00000000000E-5,-1E5]";
str.slice(1, str.length-1).split(',').map(Number);
// [-0.9999, 1, 0.00001, -100000]

parseFloat basic syntax is parseFloat(string). https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/parseFloat
If you think the input values are only numbers you can use Number(x) rather than parseFloat.
Also, you might get different values upon parsing because all floating-point math is based on the IEEE [754] standard. so use toPrecision() method to customize your values- https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_objects/Number/toPrecision.

Instead of you writing the for loop, you can always use the javascript built in array.prototypes
var string = "[1.,-0.9999,-1.00000E-5]";
var array = string.substr( 1, string.length-2 ).split(',');
console.log(array.map(function(i){return parseFloat(i);}));
you can also use the unary operator instead of parseFloat().
console.log(array.map(function(i){return +i;}));

Most efficient to extract is replacing and splitting.
var str = "[312.413,436.6546,34.1]"; // string
str = () => str.replace(/\[|\]/g, "").split(","); //[312.413, 4...] Array
most eficient to parse is just preceed the string with a "+", that will numerify it and, since javascript works with floats as primitives (and not integers), they will be automatically parsed.
var a = "1.00000000000E-5";
console.log( +a ); // 0.00001

Find the largest number from a string using a regular expression

I have a variable string like:
var myString = "857nano620348splitted3412674relation5305743";
How do I find the largest number from this?
I have tried like the below without any success.
var matches = myString.match(/d+/g);

I'd go for
var myString = "857nano620348splitted3412674relation5305743";
var largest = Math.max.apply(null, myString.match(/\d+/g));
FIDDLE
myString.match(/\d+/g) returns an array of the numbers, and using Math.max.apply(scope, array) returns the largest number in that array.

var numArray = xmr.match(/\d+/g); //this will store all numbers from xmr to numArray.
numArray.sort(function(a,b){return a-b});
var largest = numArray[numArray.length - 1];

You can use the following solution to find the largest number from a string using a regular expression:
var myString ="857nano620348splitted3412674relation5305743";
Math.max(...myString.match(/\d+/g))`

Count the elements in string

I have a string that has comma separated values. How can I count how many elements in the string separated by comma?
e.g following string has 4 elements
string = "1,2,3,4";

myString.split(',').length

var mystring = "1,2,3,4";
var elements = mystring.split(',');
return elements.length;

All of the answers suggesting something equivalent to myString.split(',').length could lead to incorrect results because:
"".split(',').length == 1
An empty string is not what you may want to consider a list of 1 item.
A more intuitive, yet still succinct implementation would be:
myString.split(',').filter((i) => i.length).length
This doesn't consider 0-character strings as elements in the list.
"".split(',').filter((i) => i.length).length
0
"1".split(',').filter((i) => i.length).length
1
"1,2,3".split(',').filter((i) => i.length).length
3
",,,,,".split(',').filter((i) => i.length).length
0

First split it, and then count the items in the array. Like this:
"1,2,3,4".split(/,/).length;

First You need to convert the string to an array using split, then get the length of the array as a count, Desired Code here.
var string = "1,2,3,4";
var desiredCount = string.split(',').length;