How to write or in JavaScript?

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 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).

What is == and === in JavaScript?

== 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. … It returns true only if both values and data types are the same for the two variables.

What does || mean in JavaScript?

Logical OR operator

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 .

What is 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.

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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.

What does != Mean in JS?

not equal to

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.

What is hoisting in JavaScript?

Hoisting is a JavaScript mechanism where variables and function declarations are moved to the top of their scope before code execution. Inevitably, this means that no matter where functions and variables are declared, they are moved to the top of their scope regardless of whether their scope is global or local.

Is equal to JavaScript?

In JavaScript it means of the same value and type. The === operator is called a strict comparison operator, it does differ from the == operator. Lets take 2 vars a and b. For “a == b” to evaluate to true a and b need to be the same value.

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.

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What is the main use of JavaScript?

Web Development

JavaScript is a client scripting language which is used for creating web pages. It is a standalone language developed in Netscape. It is used when a webpage is to be made dynamic and add special effects on pages like rollover, roll out and many types of graphics.

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