What is the difference between an expression?

In JavaScript we have expression and statement. Even though I read the definition about it multiple times, after a while, I still forget which one is which.

In JavaScript we have expression and statement. Even though I read the definition about it multiple times, after a while, I still forget which one is which. So, this post is a reminder for everyone like me who confuses these two, so you will never forget it but always keep in mind the difference between expression and statement.

A JS expression is any valid code that resolves into a value and can be written whenever you would expect a value. Usually expression are written in only one line. For example:

• 42 // a number
• “Hello World” // a string
• 42 + 1 // a calculation
• x = 42 + 1 // calculation
• myVar // a variable
• myFun() // a function that returns a value
• …

But it’s more complicated than you think . There are different types of expressions:

• Arithmetic: Resolves to a number, e.g.

42

42 + 1

etc.

• String: Resolves to a string, e.g.

"Hello World"

"123"

etc.

• Logical: Resolves to true or false and often uses a logical operator, e.g.

coding programming software-development web-development javascript

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