What Is == And === In JavaScript?

What does === mean?

Strict equality (===) means values which we are comparing must have the same type.

This means “2” will not be equal to 2 (“2″===2 it will return false) Type converting equality (==) means automatically it will covert the variable to value irrespective of data type; either it is a string or a number..

What is JavaScript simple definition?

JavaScript is a dynamic computer programming language. It is lightweight and most commonly used as a part of web pages, whose implementations allow client-side script to interact with the user and make dynamic pages. It is an interpreted programming language with object-oriented capabilities.

Why is JavaScript used?

JavaScript is a text-based programming language used both on the client-side and server-side that allows you to make web pages interactive. Where HTML and CSS are languages that give structure and style to web pages, JavaScript gives web pages interactive elements that engage a user.

What does the 3 equal sign mean?

In mathematics, the triple bar is sometimes used as a symbol of identity or an equivalence relation (although not the only one; other common choices include ~ and ≈). Particularly, in geometry, it may be used either to show that two figures are congruent or that they are identical.

What is == in Python?

The == operator compares the value or equality of two objects, whereas the Python is operator checks whether two variables point to the same object in memory. In the vast majority of cases, this means you should use the equality operators == and !=

What does === mean in JavaScript?

triple equals operatorThe 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.

Why would you use === instead of ==?

Use === instead of == ) operator performs an automatic type conversion if needed. The === (or !== ) operator will not perform any conversion. It compares the value and the type, which could be considered faster (jsPref) than == .

What is JSX?

JSX stands for JavaScript XML. JSX allows us to write HTML in React. JSX makes it easier to write and add HTML in React.

Why is it called JavaScript?

The name JavaScript came from Netscape’s support of Java applets within its browser. Many say it was also a marketing tactic to divert some attention from Java, which was the most buzzed-about language at the time. To run Java programs, the code must be first compiled into an executable form.

What is DOS short for?

DOS is a platform-independent acronym for Disk Operating System which later became a common shorthand for disk-based operating systems on IBM PC compatibles.

What is the difference between == and === operators?

In one word, main difference between “==” and “===” operator is that formerly compares variable by making type correction e.g. if you compare a number with a string with numeric literal, == allows that, but === doesn’t allow that, because it not only checks the value but also type of two variable, if two variables are …

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.

What is hoisting in JavaScript?

JavaScript Declarations are Hoisted In JavaScript, a variable can be declared after it has been used. In other words; a variable can be used before it has been declared.

What does ≡ mean in math?

(mathematics) “is equivalent to” (mathematics) “is identically equal to”. “is defined as” or “is set to”. The functions f and g satisfy f≡g if and only if their respective domain of definition coincide, and if f(x)=g(x) for all x in this domain.

Is equal to JavaScript?

Comparison OperatorsOperatorDescriptionReturns===equal value and equal typetruefalse!=not equaltrue!==not equal value or not equal typefalse9 more rows