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What is a JavaScript Expression? - Mastering JS
What is a JavaScript Expression?
Many frameworks, like Vue, allow you to embed JavaScript expressions in HTML. But what is an expression? Can you put `if` statements in an expression?
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Expression do evaluate to a value.
0 // 0
1 + 1 // 2
'Hello' + ' ' + 'World' // 'Hello World'
{ answer: 42 } // { answer: 42 }
Object.assign({}, { answer: 42 }) // { answer: 42 }
answer !== 42 ? 42 : answer // 42
answer = 42 // 42
Statement do not evaluate to a value.
// `if` statement
if (answer !== 42) { answer = 42 }
//`for` is a statement
for (;;){ console.log('Hello, World'); }
//Declaring a variable is a statement
let answer = 42
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