How to say or in JavaScript?

What is the OR operator in JavaScript?

|| is known as OR operator. It checks whether any one of the two operands is non-zero (0, false, undefined, null or “” is considered as zero).

How do you write or condition in JavaScript?

Simply use the logical “OR” operator, that is || . Worth noting that || will also return true if BOTH A and B are true . In JavaScript, if you’re looking for A or B , but not both, you’ll need to do something similar to: if( (A && !B)

What does || mean in JavaScript?

Logical OR operator

What is the difference between == and === in JS?

== in JavaScript is used for comparing two variables, but it ignores the datatype of variable. === is used for comparing two variables, but this operator also checks datatype and compares two values. Checks the equality of two operands without considering their type.

What does 3 dots mean in JavaScript?

spread / rest operator

What are the 3 logical operators?

There are three logical operators in JavaScript: || (OR), && (AND), ! (NOT). Although they are called “logical”, they can be applied to values of any type, not only boolean.21 мая 2020 г.

Is null in JavaScript?

Falsy equality using ==

One way to check for null in JavaScript is to check if a value is loosely equal to null using the double equality == operator: … So, when programming to check if a variable has any value at all before trying to process it, you can use == null to check for either null or undefined .

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What is the use of in JavaScript?

It is usally used to signify a variable holding a jquery or other JavaScript framework object, because they can have shorthand $ function.. It is just easier to identify the type of the contents..

What is a condition in JavaScript?

A condition is an expression that evaluates whether something is true or false. When the value of a condition is true, we say that this condition is satisfied. We have already studied numbers and strings, two types of data in JavaScript. … This type has two possible values: true and false.

What is JavaScript simple definition?

JavaScript is a programming language commonly used in web development. It was originally developed by Netscape as a means to add dynamic and interactive elements to websites. … Like server-side scripting languages, such as PHP and ASP, JavaScript code can be inserted anywhere within the HTML of a webpage.

What does != Mean in JS?

not equal to

What does || mean in coding?

logical OR operator

What does === mean?

1 x === y. The triple equals operator ( === ) returns true if both operands are of the same type and contain the same value. If comparing different types for equality, the result is false. This definition of equality is enough for most use cases.

Is NaN in JavaScript?

JavaScript Number isNaN() Method

isNaN() method determines whether a value is NaN (Not-A-Number). … The global isNaN() function converts the tested value to a Number, then tests it. Number. isNaN() does not convert the values to a Number, and will not return true for any value that is not of the type Number.

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