I have a string like below
var exampleString = "Name:Sivakumar ; Tadisetti;Country:India"
I want to split above string with semi colon, so want the array like
var result = [ "Name:Sivakumar ; Tadisetti", "Country:India" ]
But as the name contains another semi colon, I am getting array like
var result = [ "Name:Sivakumar ", "Tadisetti", "Country:India" ]
Here Sivakumar ; Tadisetti value of the key Name
I just wrote the code like exampleString.split(';')... other than this not able to get an idea to proceed further to get my desired output. Any suggestions?
Logic to split: I want to split the string as array with key:value pairs
Since .split accepts regular expressions as well, you can use a one that matches semicolons that are only followed by alphanumeric characters that end in : (in effect if they are followed by another key)
/;(?=\w+:)/
var exampleString = "Name:Sivakumar ; Tadisetti;Country:India";
var result = exampleString.split(/;(?=\w+:)/);
console.log(result)
here is an approach which we first split the input on ; and then concat the element without : with the previous one; since it shouldn't being spited.
let exampleString = "Name:Sivakumar ; Tadisetti;Country:India"
let reverseSplited = exampleString.split(";").reverse();
let prevoiusString;
let regex = /[^:]+:.*/;
let result = reverseSplited.map( str => {
if(regex.test(str)) {
if(prevoiusString){
let returnValue = str + ";" + prevoiusString;
prevoiusString = null;
return returnValue
}
return str
}
prevoiusString = str;
}).filter(e=>e);
console.log(result);
I have a string variable with array data .
var str = "[\r\n 10,\r\n 20\r\n]" ;
I want to convert above string to array like using javascript .
Output :-
var arr = [10,20];
You can simply use JSON.parse - it will ignore the newlines and convert the string representation of an array to a JavaScript array:
var str = "[\r\n 10,\r\n 20\r\n]" ;
var arr = JSON.parse(str);
console.log(Array.isArray(arr))
console.log(arr)
You need only to parse that string as a JSON, because it is clearly an array.
So this is the procedure:
var str = "[\r\n 10,\r\n 20\r\n]";
const myArray = JSON.parse(str);
console.log(myArray);
UPDATE:
If you are wondering why those special chars (\r\n) are going away:
// a string
const str = "[\r\n 10,\r\n 20\r\n]";
// if I print out this, Javascript, will automatically replace those special
// chars with what they means (new line)
console.log(str);
console.log(typeof(str));
// so if we are going to parse our string to the JSON parser
// it will automatically transform the special chars to new lines
// and then convert the result string "[10,20]" to an array.
const myArray = JSON.parse(str);
console.log(myArray);
console.log(typeof(myArray));
How to use JavaScript slice to extract the first and last letter of a string?
Eg: "Hello World"
I need the result as "dH".
Following is my jsfiddle :
http://jsfiddle.net/vSAs8/
Here's the cleanest solution :
var output = input.slice(-1)+input[0];
If you want more slice, there's also
var output = input.slice(-1)+input.slice(0,1);
And here are alternate fun (and less efficient) solutions :
var output = input.replace(/^(.).*(.)$/,'$2$1');
or
var output = input.match(/^.|.$/g).reverse().join('');
Substr works as well:
alert(test.substr(-1,1) + test.substr(0,1));
a.charAt(a.length-1) + a.charAt(0)
var str = " Virat Kohali "
var get_string_label = function(str){
str = str.split(" ");
str = str.filter(res=>res.length>0);
str = str.map(function(res){
return res[0].toUpperCase();
});
str = str.join("");
return str;
};
console.log(get_string_label(str));
str.split(" "); method splits a String object into an array of strings by separating the string into substrings, where it will find space in string.
then str.filter(res=>res.length>0) will filter out string having zero length (for "virat kohali" string you will get empty sub-string)
after that using map function you can fetch your first letter
How can I convert a string to a JavaScript array?
Look at the code:
var string = "0,1";
var array = [string];
alert(array[0]);
In this case alert shows 0,1. If it where an array, it would show 0. And if alert(array[1]) is called, it should pop-up 1
Is there any chance to convert such string into a JavaScript array?
For simple array members like that, you can use JSON.parse.
var array = JSON.parse("[" + string + "]");
This gives you an Array of numbers.
[0, 1]
If you use .split(), you'll end up with an Array of strings.
["0", "1"]
Just be aware that JSON.parse will limit you to the supported data types. If you need values like undefined or functions, you'd need to use eval(), or a JavaScript parser.
If you want to use .split(), but you also want an Array of Numbers, you could use Array.prototype.map, though you'd need to shim it for IE8 and lower or just write a traditional loop.
var array = string.split(",").map(Number);
Split it on the , character;
var string = "0,1";
var array = string.split(",");
alert(array[0]);
This is easily achieved in ES6;
You can convert strings to Arrays with Array.from('string');
Array.from("01")
will console.log
['0', '1']
Which is exactly what you're looking for.
If the string is already in list format, you can use the JSON.parse:
var a = "['a', 'b', 'c']";
a = a.replace(/'/g, '"');
a = JSON.parse(a);
Convert all type of strings
var array = (new Function("return [" + str+ "];")());
var string = "0,1";
var objectstring = '{Name:"Tshirt", CatGroupName:"Clothes", Gender:"male-female"}, {Name:"Dress", CatGroupName:"Clothes", Gender:"female"}, {Name:"Belt", CatGroupName:"Leather", Gender:"child"}';
var stringArray = (new Function("return [" + string+ "];")());
var objectStringArray = (new Function("return [" + objectstring+ "];")());
JSFiddle https://jsfiddle.net/7ne9L4Lj/1/
Result in console
Some practice doesnt support object strings
- JSON.parse("[" + string + "]"); // throw error
- string.split(",")
// unexpected result
["{Name:"Tshirt"", " CatGroupName:"Clothes"", " Gender:"male-female"}", " {Name:"Dress"", " CatGroupName:"Clothes"", " Gender:"female"}", " {Name:"Belt"", " CatGroupName:"Leather"", " Gender:"child"}"]
For simple array members like that, you can use JSON.parse.
var listValues = "[{\"ComplianceTaskID\":75305,\"RequirementTypeID\":4,\"MissedRequirement\":\"Initial Photo Upload NRP\",\"TimeOverdueInMinutes\":null}]";
var array = JSON.parse("[" + listValues + "]");
This gives you an Array of numbers.
now you variable value is like array.length=1
Value output
array[0].ComplianceTaskID
array[0].RequirementTypeID
array[0].MissedRequirement
array[0].TimeOverdueInMinutes
You can use split
Reference:
http://www.w3schools.com/jsref/jsref_split.asp
"0,1".split(',')
Another option using the ES6 is using Spread syntax.
var convertedArray = [..."01234"];
var stringToConvert = "012";
var convertedArray = [...stringToConvert];
console.log(convertedArray);
use the built-in map function with an anonymous function, like so:
string.split(',').map(function(n) {return Number(n);});
[edit] here's how you would use it
var string = "0,1";
var array = string.split(',').map(function(n) {
return Number(n);
});
alert( array[0] );
How to Convert Comma Separated String into an Array in JavaScript?
var string = 'hello, world, test, test2, rummy, words';
var arr = string.split(', '); // split string on comma space
console.log( arr );
//Output
["hello", "world", "test", "test2", "rummy", "words"]
For More Examples of convert string to array in javascript using the below ways:
Split() – No Separator:
Split() – Empty String Separator:
Split() – Separator at Beginning/End:
Regular Expression Separator:
Capturing Parentheses:
Split() with Limit Argument
check out this link
==> https://www.tutsmake.com/javascript-convert-string-to-array-javascript/
You can use javascript Spread Syntax to convert string to an array. In the solution below, I remove the comma then convert the string to an array.
var string = "0,1"
var array = [...string.replace(',', '')]
console.log(array[0])
I remove the characters '[',']' and do an split with ','
let array = stringObject.replace('[','').replace(']','').split(",").map(String);
More "Try it Yourself" examples below.
Definition and Usage
The split() method is used to split a string into an array of substrings, and returns the new array.
Tip: If an empty string ("") is used as the separator, the string is split between each character.
Note: The split() method does not change the original string.
var res = str.split(",");
Regexp
As more powerful alternative to split, you can use match
"0,1".match(/\d+/g)
let a = "0,1".match(/\d+/g)
console.log(a);
Split (",") can convert Strings with commas into a String array, here is my code snippet.
var input ='Hybrid App, Phone-Gap, Apache Cordova, HTML5, JavaScript, BootStrap, JQuery, CSS3, Android Wear API'
var output = input.split(",");
console.log(output);
["Hybrid App", " Phone-Gap", " Apache Cordova", " HTML5", "
JavaScript", " BootStrap", " JQuery", " CSS3", " Android Wear API"]
var i = "[{a:1,b:2}]",
j = i.replace(/([a-zA-Z0-9]+?):/g, '"$1":').replace(/'/g,'"'),
k = JSON.parse(j);
console.log(k)
// => declaring regular expression
[a-zA-Z0-9] => match all a-z, A-Z, 0-9
(): => group all matched elements
$1 => replacement string refers to the first match group in the regex.
g => global flag
Why don't you do replace , comma and split('') the string like this which will result into ['0', '1'], furthermore, you could wrap the result into parseInt() to transform element into integer type.
it('convert string to array', function () {
expect('0,1'.replace(',', '').split('')).toEqual(['0','1'])
});
Example using Array.filter:
var str = 'a,b,hi,ma,n,yu';
var strArr = Array.prototype.filter.call(str, eachChar => eachChar !== ',');