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How to count character followed by Special Character in string using Javascript [closed]

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My string is: Hello 1⃣2⃣3⃣ world.
The expected result is 3 (1⃣ 2⃣ and 3⃣)
Matching condition has total 12 value below:
(0⃣ 1⃣ 2⃣ 3⃣ 4⃣ 5⃣ 6⃣ 7⃣ 8⃣ 9⃣ *⃣ #⃣ )
How to use javascript to count total of result? Thank you.
// Get code of emoji
function getEmojiUnicode(emoji) {
var comp;
if (emoji.length === 1) {
comp = emoji.charCodeAt(0);
}
comp = (
(emoji.charCodeAt(0) - 0xD800) * 0x400
+ (emoji.charCodeAt(1) - 0xDC00) + 0x10000
);
if (comp < 0) {
comp = emoji.charCodeAt(0);
}
return comp.toString("16");
};
// count how many times emoji appears
function countSpecialCharacter(string) {
// what should I write here?
return result;
}
var inputString = 'Hello 1⃣2⃣3⃣ world';
var output = countSpecialCharacter(inputString); // this should be 3
Definition of Combining Enclosing Keycap is here
https://emojipedia.org/combining-enclosing-keycap/

1) Split the string by ' ' and get the words
2) Check each word if it had enclosing keyCap
3) If so, return length/2 (because each char has one enclose)
const count = line => {
const valid_chars = Array.from("0123456789*#");
const sp_chars = line.split(" ").find(x => x.includes("⃣"));
if (sp_chars && sp_chars.length % 2 === 0) {
return Array.from(sp_chars).filter(x => valid_chars.includes(x)).length;
}
return 0;
};
console.log(count("Hello 1⃣2⃣3⃣-⃣ world"));

I think what you need to do is iterate through each character you have in your string, looking at the unicode character. Once you have this you can compare this to a list of unicode characters you know are 'Keycaps' - giving you the count.
I.e (this is just checking the first character in a string as an example):
function isCharacterAKeycap(str) {
var keycapUnicodeValues = [8000, 8001, 8002];
return keycapUnicodeValues.includes(str.charCodeAt[0]);
}
str = "1⃣";
isCharacterAKeycap(str);

How can i split this string format to array for in javascript? [closed]

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Dear all,
Currently am trying to split this string format: x:10/08/2018,10/08/2018,10/08/2018~y:10,20,12 to array format like this:
[
{ x:10/08/2018, y: 10 },
{ x:10/08/2018, y: 20 },
{ x:10/08/2018, y: 12 }
]
Who have experience with this split by using javascript could you please tell me now. Thanks in advance.

First split the string using split() method and ~ as a separator
Next , split the first part using , as a separator.
Next , split the second part using , as a separator.
Store each x and its corresponding y inside an object , then push that object into an empty array.
Use JSON.stringify() to convert to JSON string format.
var str = "x:10/08/2018,10/08/2018,10/08/2018~y:10,20,12";
var x = str.split("~")[0].split(":")[1].split(","); //get the value of "x"
var y = str.split("~")[1].split(":")[1].split(","); //get the value of "y";
var resultArray = [];
for (var i = 0; i < x.length; i++) {
resultArray.push({
x : x[i],
y : y[i]
});
}
var finalResult = JSON.stringify(resultArray);
document.write(finalResult);
Further info can be found here:
split(): https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/split
JSON.stringify(): https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/JSON/stringify

JavaScript prototypes - technical interview [closed]

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I had a JavaScript interview last wednesday, and I had trouble with one of the questions. Maybe you guys can give me hand with it?
The question was: how would you go about this printing var a and s to the console, in camel case, with the help of a prototype function...
var s = “hello javier”;
var a = “something else”;
String.prototype.toCamelCase = function() {
/* code */
return capitalize(this);
};
...so the result is the same as doing this?
console.log(s.toCamelCase());
console.log(a.toCamelCase());
>HelloJavier
>SomethingElse
Thanks!

var s = 'hello javier';
var a = 'something else';
String.prototype.toCamelCase = function() {
return capitalize(this);
};
function capitalize(string) {
return string.split(' ').map(function(string) {
return string.charAt(0).toUpperCase() + string.slice(1);
}).join('');
}
console.log(a.toCamelCase());
console.log(s.toCamelCase());
Reference
How do I make the first letter of a string uppercase in JavaScript?

I would go with something like this:
var s = "hello javier";
var a = "something else";
String.prototype.toCamelCase = function() {
function capitalize(str){
var strSplit = str.split(' ');
// starting the loop at 1 because we don't want
// to capitalize the first letter
for (var i = 1; i < strSplit.length; i+=1){
var item = strSplit[i];
// we take the substring beginning at character 0 (the first one)
// and having a length of one (so JUST the first one)
// and we set that to uppercase.
// Then we concatenate (add on) the substring beginning at
// character 1 (the second character). We don't give it a length
// so we get the rest.
var capitalized = item.substr(0,1).toUpperCase() + item.substr(1);
// then we set the value back into the array.
strSplit[i] = capitalized;
}
return strSplit.join('');
}
return capitalize(this);
};
// added for testing output
console.log(s.toCamelCase());
console.log(a.toCamelCase());

Javascript Numbers and Comma with input pattern [closed]

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Hi I need to combine 2 error checking procedures. I dont use jquery
I only want these values appear 0123456789,
My HTML, i need to know the pattern for other instances of my website
<input type="text" pattern="?" maxlength="10" id="f2f11c3" value="0"></input>
My JS
document.getElementById("f2f11c3").addEventListener("keyup", function(){addcommas("f2f11c3")}, false);
.
function addcommas(id)
{
//i dont know what to place here
//every 3 numbers must have a comma
//ie. input is 123.c39,1mc
//it must also remove if a comma is placed manually
//result must be 123,391
}
Hope someone could help. Thanks!

document.getElementById('f2f11c3').
addEventListener("input", function(){addcommas();}, false);
function addcommas()
{
var v = document.getElementById('f2f11c3');
var t = v.value.replace(/\D/g, '');
var i,temp='';
for(i=t.length; i>=0;i-=3){
if(i==t.length) {
temp=t.substring(i-3,i);
}
else
{
if(t.substring(i-3,i)!="")
temp = t.substring(i-3,i)+','+temp;
}
if(i<0) {temp=t.substring(0,i+3)+','+temp; break;}
}
v.value = temp;
}
DEMO

function addcommas(id) {
var arr = [];
// loop over the id pushing numbers into the array
for (var i = 0, l = id.length; i < l; i++) {
if (id[i] >= 0 && id[i] <= 9) {
arr.push(id[i]);
}
}
// loop over the array splicing in commas at every 3rd position
for (var i = 0, l = arr.length; i < l; i += 3) {
arr.splice(i, 0, ',');
i++;
l++;
}
// remove the first unnecessary comma
arr.shift()
// return the comma-separated string
return arr.join('');
}
DEMO

The id is an HTML element's id, not the value
function addcommas(id)
{
//Not really needed, but just to shorten the details below
var x = document.getElementById(id);
//Current value but removes anything aside from numbers 0-9 and comma (not really needed)
var curval = x.value.replace(/[^\d,]/g,'');
//Strips the comma from the current value if someone entered it manually.
var nocomma = x.value.replace(/[^\d]/g,'');
//If not blank, prevent NAN error
if (nocomma.length>0)
{
//Converts text to int
nocomma = parseInt(nocomma, 10);
//Dont know why, but doesnt work without this
nocomma = nocomma+0;
//Converts it back to string to add the comma
nocomma = nocomma+"";
//Adds comma every 3 numbers, I got this from other research, dont know how it works
x.value = nocomma.replace(/(\d)(?=(\d{3})+$)/g, '$1,');
}
}
My Input in the HTML is as follows
//for iphone, this will popout the numberpad with choices 0-9 only. Easier to type, better mobile usability.
<input type="text" pattern="\d*" maxlength="12" id="f2f11c3" value="0"></input>

Variable.match for amount > 999.99 [closed]

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For example :
Var1 = 289.56
I use this formula :
foundStr = Var1.match("[0-9]+\.[0-9]+");
Price( parseFloat(foundStr).toFixed(2) );
But when Var1 > 999.99 (Example : 2,356.21)
What is the script find the string ?
foundStr = Var1.match(??);
Thank you

You already have a numeric variable, why are you messing with strings?
var number1 = 289.56;
if (number1 > 999.99) {
// do whatever
}
If you're trying to round, use Math.floor instead:
var number1 = 289.56485345734593453;
var roundedNumber1 = Math.floor(number1 * 10) / 10; // two decimal points

I think you just want to remove the commas and check if its a float, but its hard to tell based off your question. How about something like this:
var Var1 = "1,234.567";
var parsed = parseFloat(Var1.replace(",",""), 10);
if (isNaN(parsed)) {
// its not a valid number, so deal with it as needed
}
else {
// parsed now holds your Number, so use it
}
This approach will work regardless of if the number is >= 1000.

var Var1 = "2,356.21";
foundStr = String(Var1.match(/([0-9]{1,3},)?[0-9]{0,3}\.[0-9]+/g)).replace(/,/g, "");
var result = parseFloat(foundStr).toFixed(2);