Readers ask: Javascript Ou Javascript?

What does || mean in JS?

The Logical OR operator ( || ) is an operator that returns its first or second operand depending on whether the first is truthy. A “truthy” value means anything other than 0, undefined, null, “”, or false.

What is << in JavaScript?

The left shift operator ( << ) shifts the first operand the specified number of bits to the left. Excess bits shifted off to the left are discarded. Zero bits are shifted in from the right.

What is comparison operator in JavaScript?

A comparison operator compares its operands and returns a logical value based on whether the comparison is true. The operands can be numerical, string, logical, or object values. Strings are compared based on standard lexicographical ordering, using Unicode values.

What does i ++ mean in JavaScript?

The increment operator adds 1 to the operand and the decrement operator subtracts 1 from the operand.

What is the three dots in JavaScript?

The three dots in JavaScript are the spread / rest operator. The spread syntax allows an expression to be expanded in places where multiple arguments are expected. The rest parameter syntax is used for functions with a variable number of arguments. The spread / rest operator for arrays was introduced in ES6.

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What’s JavaScript used for?

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.

Is JavaScript a 32-bit?

JavaScript has several bitwise operators that work with 32-bit integers. That is, they convert their operands to 32-bit integers and produce a result that is a 32-bit integer. Use cases for these operators include processing binary protocols, special algorithms, etc.

Should you use strict mode JavaScript?

Strict mode is an important part of modern JavaScript. Strict mode makes several changes to JavaScript semantics. It eliminates silent errors and instead throws them so that the code won’t run with errors in the code. It will also point out mistakes that prevent JavaScript engines from doing optimizations.

What is a class JavaScript?

Classes are a template for creating objects. They encapsulate data with code to work on that data. Classes in JS are built on prototypes but also have some syntax and semantics that are not shared with ES5 class-like semantics.

Where should JavaScript be placed?

JavaScript in body or head: Scripts can be placed inside the body or the head section of an HTML page or inside both head and body. JavaScript in head: A JavaScript function is placed inside the head section of an HTML page and the function is invoked when a button is clicked.

Is a number JavaScript?

In JavaScript, there are two ways to check if a variable is a number: isNaN() – Stands for “is Not a Number”, if variable is not a number, it return true, else return false. typeof – If variable is a number, it will returns a string named “number”.

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What is the difference between equal to and equal to 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. Checks the equality of two operands without considering their type. Return true if the two operands are equal.

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. This means JavaScript functions can run after a webpage has loaded without communicating with the server.

What does the ++ mean?

++ is the increment operator. It increment of 1 the variable. x++; is equivalent to x = x + 1; or to x += 1; The increment operator can be written before (pre – increment) or after the variable (post-increment).

How do you wait in JavaScript?

When we talk about implementing a delay function, the most widely used method is the asynchronous setTimeout().

  1. Use the setTimeout() to Wait for X Seconds in JavaScript.
  2. Use promises and async/await to Wait for X Seconds in JavaScript.
  3. Use the for Loop to Implement Synchronous delay Function in JavaScript.

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