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Discussion on: Share a code snippet in any programming language and describe what's going on

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Replies for: // javascript { const x = 1 { const x = 2 // no error { console.log(x) // 2 const x = 3 console.log(x) // 3 } ...

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moopet profile image
Ben Sinclair •

Const doesn't denote read-only, it only means you can't reassign it in the same scope. You can mutate it all you want (provided it's a type that's mutable in the first place)

const x = [1, 2, 3];

x.push(4);
delete x[0];

// [ <empty slot>, 2, 3, 4 ]
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crowdozer profile image
crowdozer • • Edited

I worded it a bit slopy, a "read-only reference to a value" according to MDN, but it's all semantics as long as we understand how it works =]