This question already has answers here:
How to convert a string to an integer in JavaScript
(32 answers)
parseInt vs unary plus, when to use which?
(6 answers)
JavaScript primitive types and corresponding objects
(2 answers)
What is the difference between JavaScript object and primitive types?
(1 answer)
What is the difference between a number and a number object?
(3 answers)
Closed 3 years ago.
I see there + operator is being used to convert a string number to number and same does the Number() function ,
So i am wondering there must be good reason for + operator before string number being used in most cases over Number()
Is there any performance enhancement with + operator?
appreciate your help guys
note : don't get confuse with concatenation of string , its unary + oprator
Related
This question already has answers here:
Adding two numbers concatenates them instead of calculating the sum
(24 answers)
Why does JavaScript handle the plus and minus operators between strings and numbers differently?
(7 answers)
Closed 15 days ago.
Why the + operator with pure numeric value in string always concat them not actually perform operations on string numeric also just like other operators ?
Why they are concating them not did the + operation on it just like -.
For example
"10"-1
< 9
but
"10"+"1" is
<"101" but not
<"11"
This question already has answers here:
How to convert a string to an integer in JavaScript
(32 answers)
Closed 1 year ago.
Convert the string "42" into a number explicitly.
I have to do this in javascript. What's the conversion
that s the problem
Use the parseInt(); function
var a = parseInt("42")
console.log(a);
This question already has answers here:
How to avoid scientific notation for large numbers in JavaScript?
(27 answers)
What is JavaScript's highest integer value that a number can go to without losing precision?
(21 answers)
Closed 4 years ago.
I am converting a long Sting of numbers values to number data type with Number() and parseInt() method of js but it is returning a hexadecimal value.
Does anybody know how to convert a long string values of number to Number data type?
// "1245458787546574878756756754561464567867"(type:String) to 1245458787546574878756756754561464567867 (type:Number)
var str = "1245458787546574878756756754561464567867";
console.log(Number(str)); //1.2454587875465749e+39
console.log(parseInt(str)); //1.2454587875465749e+39
console.log(parseInt(str,10)); //1.2454587875465749e+39
console.log(str.length); //40
This question already has answers here:
javascript large integer round because precision? (why?)
(2 answers)
Javascript long integer
(3 answers)
Closed 4 years ago.
this is code
const str = '1111';
console.log(Number(str));
But When String's length over 17, it will be have problem
const str = '111100000123121221234'
console.log(Number(str)); // 111100000123121220000
I want to know, what's the principle of convert string to Integer of Number Object. Why convert wrong
Thank You Very Much
Because "Integers (numbers without a period or exponent notation) are accurate up to 15 digits". See: https://www.w3schools.com/js/js_numbers.asp
This question already has answers here:
Why is one string greater than the other when comparing strings in JavaScript?
(5 answers)
Javascript string/integer comparisons
(9 answers)
Closed 8 years ago.
Is this a failure in JavaScript's attempt to convert them to numbers? If so, what numbers are they being converted to? Or what is the logic behind the string 10 being less than the string 9?
It's comparing the strings "alphabetically", and 1 comes before 9 in the character "alphabet".