What do semicolons do in JavaScript?

What does a semicolon mean in JavaScript?

The semicolon in JavaScript is used to separate statements, but it can be omitted if the statement is followed by a line break (or there’s only one statement in a { block } ). A statement is a piece of code that tells the computer to do something.

Do semicolons do anything in JavaScript?

JavaScript semicolons are optional. … This is all possible because JavaScript does not strictly require semicolons. When there is a place where a semicolon was needed, it adds it behind the scenes. The process that does this is called Automatic Semicolon Insertion.

What are semicolons do?

A semicolon is most commonly used to link (in a single sentence) two independent clauses that are closely related in thought. When a semicolon is used to join two or more ideas (parts) in a sentence, those ideas are then given equal position or rank.

Why are semicolons optional in JavaScript?

The reason semicolons are sometimes optional in JavaScript is because of automatic semicolon insertion, or ASI. ASI doesn’t mean that actual semicolons are inserted into your code, it’s more of a set of rules used by JavaScript that will determine whether or not a semicolon will be interpreted in certain spots.

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When should I use semicolons in JavaScript?

The rules of JavaScript Automatic Semicolon Insertion

  1. when the next line starts with code that breaks the current one (code can spawn on multiple lines)
  2. when the next line starts with a } , closing the current block.
  3. when the end of the source code file is reached.
  4. when there is a return statement on its own line.

Should I use semicolons in TypeScript?

Conclusion. Use TypeScript (with no-unexpected-multiline) and safely omit semicolons.

What is difference between VAR and let in JavaScript?

var and let are both used for variable declaration in javascript but the difference between them is that var is function scoped and let is block scoped. It can be said that a variable declared with var is defined throughout the program as compared to let.

Do you need semicolons in react?

One camp writes code that includes semicolons. Their code looks a bit more like a language that actually requires semicolons, like C or PHP. The other camp leaves the semicolons off, relying on ASI to put them in automatically. … For example, React still includes semicolons in its docs, but Vue does not.

Is JavaScript object Oriented?

To be more precise, JavaScript is a prototype based object oriented language, which means it doesn’t have classes rather it define behaviors using constructor function and then reuse it using the prototype. … JavaScript classes provide a much simpler and clearer syntax to create objects and deal with inheritance.

What are some examples of semicolons?

Examples of Semicolons: Joan likes eggs; Jennifer does not. The cat slept through the storm; the dog cowered under the bed. Semicolons are also used in a sentence when something stronger than a comma is needed.

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Where do you put a semicolon example?

When to Use a Semicolon

  • Semicolons separate items in a complex list. For example, The Council is comprised of ten members: three from Sydney, Australia; four from Auckland, New Zealand; two from Suva, Fiji; and one from Honiara, Solomon Islands.
  • Semicolons join two closely related independent clauses.
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