This question already has answers here:
Why is NaN not equal to NaN? [duplicate]
(6 answers)
Closed 9 years ago.
What is the reasoning? I believe this is the only value not equal to itself in JavaScript.
NaN isn't equal to NaN
Use the IsNaN function to check it
See here
Related
This question already has answers here:
What is JavaScript's highest integer value that a number can go to without losing precision?
(21 answers)
How does javascript represent integers greater than Number.MAX_SAFE_INTEGER internally? [duplicate]
(1 answer)
Closed 4 years ago.
I was in need to use the number 515236034100068353 but JavaScript transforms it as 515236034100068350
console.log(515236034100068353 === 515236034100068350)
Why does this happens ? How could I fix it ?
This question already has answers here:
What is the intuitive reason that NaN != NaN?
(1 answer)
Why is NaN === NaN false? [duplicate]
(3 answers)
Closed 4 years ago.
NaN==NaN
returns false in javascripts. i want to know some clear explanation.
typeof NaN is number
Number == Number is return true
Then why NaN==NaN is false. Thanks advance.
This question already has answers here:
Understanding JavaScript Truthy and Falsy
(9 answers)
Is empty string treated as falsy in javascript?
(5 answers)
Closed 4 years ago.
I have tried 2 conditions in JavaScript and output:
if(""){console.log("Called")} //No Output
if("_"){console.log("Called")} //Output: Called
What could be the possible reason for this?
The empty string is considered as a 'falsy' value, and so it's equivalent to doing:
if(false){console.log("Called")}
The empty string is equal to False if you cast it to Boolean (Type Conversion).
console.log(Boolean("")) //output: false
console.log(Boolean("somestring")) //output: true
This question already has answers here:
Why and how does ([![]]+[][[]])[+!+[]+[+[]]] evaluate to the letter "i"? [duplicate]
(2 answers)
What are JavaScript's builtin strings?
(7 answers)
Closed 5 years ago.
I found out that in JavaScript [[[!![]+[]]+[]]+[]][+[]][+[]] evaluate to "t". How is it possible?
I do know that !![] evaluates to true, however how to you obtain "t" from that?
console.log([[[!![]+[]]+[]]+[]][+[]][+[]]);
This question already has answers here:
Usage of toString in JavaScript [duplicate]
(3 answers)
Why does 10..toString() work, but 10.toString() does not? [duplicate]
(3 answers)
Closed 9 years ago.
Why
123.toString()
throws an SyntaxError
while
123..toString()
is not?
The first . you type in a Number literal is the decimal point.