This question already has answers here:
Javascript numbers concatenate instead of adding but typeof is number not string
(5 answers)
Javascript (+) sign concatenates instead of giving sum of variables
(14 answers)
Closed 6 years ago.
I have different functions which return values; So i created different function to sum both values.
function result(){
var result = firstFunct() + secondFunct();
alert(result);
return result;
}
And it gives for me a result like joint of two strings: 1010 instead 20. What kind of operator do I need to use two sum both of them?
This is most probably because your functions are returning string and not a numeric data type. You will need to cast the output of the functions
var result = Number(firstFunct()) + Number(secondFunct());
Note, casting to a number could also be done in a shorter way, using the + operator:
var result = (+firstFunct()) + (+secondFunct());
To cast to a numeric you can also do:
var num = 1 * numericstring;
Related
This question already has answers here:
How to deal with big numbers in javascript [duplicate]
(3 answers)
Closed 3 years ago.
I've been trying to add the following numbers using javascript;
76561197960265728 + 912447736
Sadly, because of rounding in javascript it will not get the correct number, I need the number as a string.
I've tried removing the last few digits using substr and then adding the two numbers together and then putting the two strings together, sadly this doesn't work if the first of the number is a 1.
function steamid(tradelink){
var numbers = parseInt(tradelink.split('?partner=')[1].split('&')[0]),
base = '76561197960265728';
var number = parseInt(base.substr(-(numbers.toString().length + 1))) + numbers;
steamid = //put back together
}
steamid('https://steamcommunity.com/tradeoffer/new/?partner=912447736&token=qJD0Oui2');
Expected:
76561198872713464
For doing operations with such big integers, you should use BigInt, it will correctly operate on integers bigger than 2ˆ53 (which is the largest size that normal Number can support on JS
const sum = BigInt(76561197960265728) + BigInt(912447736);
console.log(sum.toString());
Edit 2020: This API still not widely supported by some browsers, so you may need to have a polyfill, please check this library
This question already has answers here:
Javascript variables not adding two variables correctly, only concatenating
(3 answers)
Closed 4 years ago.
This question has an answer:
see - Javascript variables not adding two variables correctly, only concatenating
I am trying to add 5 units to a number but the number is being concatenated instead.
this.graphicState[i].shapes[j][k].x += 5
Each time this is run in a loop the outputs are
105.00
105.005
105.0055
105.00555
...
The output I am looking for is,
105.00
110.00
115.00
120.00
...
I tried,
this.graphicState[i].shapes[j][k].x += parseFloat(5)
I also tried this, but get the same results,
this.graphicState[i].shapes[j][k].x = this.graphicState[i].shapes[j][k].x + 5
Thanks,
You need to convert any/all string values to numbers in an expression that has strings as operands with + as the operator. The 5 isn't the issue, this is:
this.graphicState[i].shapes[j][k].x
So, that's what needs to be converted. You can do that easily by prepending a + to it:
+this.graphicState[i].shapes[j][k].x;
Do the conversion on the string first and then use the converted value in your mathematical expression. Here's a simplified example:
var result = "5"
result = +result + 10;
console.log(result);
Try this method
this.graphicState[i].shapes[j][k].x = (parseFloat(this.graphicState[i].shapes[j][k].x) + 5).toFixed(2);
This question already has answers here:
How to convert a number with comma as string into float number in Javascript
(2 answers)
Closed 4 years ago.
I am trying to convert 1,100.00 or 1,800.00 to 1100 or 1800 by using Javascript Number() function but it gives NaN.
For Example:
var num = "1,100.00";
console.log(Number(num));
output: NaN
My requirement is If I have a number 1,800.00 it should convert to 1800 in Javascript.
Any help will be appreciated.
Thanks.
You can replace the , char using built-in replace function and then just convert to Number.
let number = "1,100.00";
console.log(Number(number.replace(',','')));
The Number() function converts the object argument to a number that represents the object's value. If the value cannot be converted to a legal number, NaN is returned.
You might have multiple , in the string replace all , from the string before passing to Number():
let numStr = '1,800.00';
let num = Number(numStr.replace(/,/g,''));
console.log(num);
.as-console-wrapper{
top: 0;
}
You can just replace the , with empty '' and then convert the string into number with + operator
let neu = "6,100.00";
document.write(+neu.replace(',',''));
You can try this.
var myValue = '1,800.00';
var myNumber = myValue.replace(/[^0-9.]/g, '');
var result = Math.abs(myNumber);
console.log( Math.floor(myNumber))
Here, in myValue, only number is taken removing other characters except dot.
Next thing is the value is converted to positive number using Math.abs method.
And at last using Math.floor function the fraction part is removed.
This question already has answers here:
Adding two numbers concatenates them instead of calculating the sum
(24 answers)
Closed 5 years ago.
This's my codes:
var following_tags = $('.follow-tags-start').attr("data-following-tags");
$('.follow-tags-start').attr('data-following-tags', following_tags+1);
the issue that if the count of data-following-tags="0" after do the action the count add 1 with the exists count so each time i do the action it's add 1 with 0.
data-following-tags="01111"
you can use parseInt() (assuming these are integer numbers) to convert data attribute to integer, then you can add 1. something like this:
var following_tags = parseInt($('.follow-tags-start').attr("data-following-tags"));
$('.follow-tags-start').attr('data-following-tags', following_tags+1);
You can just use a callback, and coerce the value to a number
$('.follow-tags-start').attr("data-following-tags", function(attr) {
return (+attr) + 1
});
This question already has answers here:
How to add two strings as if they were numbers? [duplicate]
(20 answers)
Javascript (+) sign concatenates instead of giving sum of variables
(14 answers)
Closed 8 years ago.
It is showing 60 + 5 as 605 instead of 65
g = document.getElementById("height1").value * 12;
alert(g); <---- This is showing 60
h = document.getElementById("height2").value;
alert(h); <---- This is showing 5
b = g+h;
alert(b); <---- This is showing 605
Any ideas
Javacript is not a strongly typed language. It does it's best to interpret the type of variables and generally, if you try to add a string-like variable to an integer-like variable, it will interpret it as string concatenation.
You could force the variables to be interpreted as integers like this:
b = parseInt(g) + parseInt(h);
Or, using other tricks that will force the variable to become numeric, like this:
b = (g*1) + (h*1);
Use parseInt() to convert to integer. + in Javascript is both for adding and concatenation.
how about b = (g+h)?
make sure the vars are integers, else convert them to integers
If the values of those HTML elements are strings (like in text input boxes?) then what you're doing is concatenating strings, not adding numbers.
You need to 1) be sure the input values are actually numeric, and 2) convert the string to an integer using parseInt().