What values does JavaScript consider Falsy?

What values does JavaScript consider Falsy?

Description. A falsy value is something which evaluates to FALSE, for instance when checking a variable. There are only six falsey values in JavaScript: undefined , null , NaN , 0 , “” (empty string), and false of course.

How do you know if its truthy or Falsy?

The basic rules are: Values that evaluate to False are considered Falsy . Values that evaluate to True are considered Truthy ….If data is empty:

1. It will be a falsy value, so data will evaluate to False .
2. not data will be equivalent to not False , which is True .
3. The condition will be True .
4. The exception will be raised.

Is 0 A Falsy value JavaScript?

In JavaScript “0” is equal to false because “0” is of type string but when it tested for equality the automatic type conversion of JavaScript comes into effect and converts the “0” to its numeric value which is 0 and as we know 0 represents false value. So, “0” equals to false.

Is an empty array truthy or Falsy?

Values not on the list of falsy values in JavaScript are called truthy values and include the empty array [] or the empty object {} . This means almost everything evaluates to true in JavaScript — any object and almost all primitive values, everything but the falsy values.

Is Empty object Falsy?

The empty object is not undefined. The only falsy values in JS are 0 , false , null , undefined , empty string, and NaN .

Is NaN True or false?

NaN is special in that it doesn’t have a real value, so comparing it to itself doesn’t return true. Essentially, NaN is equal to nothing, not even NaN . The only way to reliably compare something to NaN is using isNaN( value ) .

Is an empty array Falsy JavaScript?

Is IF 0 false?

Is an empty list Falsy JavaScript?

The following values are always falsy: false. 0 (zero) “” (empty string)

What are falsy values in JavaScript?

In JavaScript, there is a specialist list of following 7 values, which are called falsy values — they all evaluate to false in conditionals: the empty string “” (equivalent to ” or “)

How many false values are there in JavaScript?

There are only six falsey values in JavaScript: undefined, null, NaN, 0, “” (empty string), and false of course. It is possible to check for a falsy value in a variable with a simple conditional:

What are the values that are always falsy?

The following values are always falsy: 1 false 2 0 (zero) 3 ” or “” (empty string) 4 null 5 undefined 6 NaN More

How do you return false values in JavaScript?

Falsey values in JavaScript Argument type Result Number If argument is +0, -0, or NaN, return fa String If argument is the empty String (its len BigInt If argument is 0n, return false; otherwi Symbol Return true.