Question #17

Author: admin

tags: JavaScript

let x = 1;
x = ++x + x++ + x;
console.log(x); // ??

What will the console output be?

1

2

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4

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7

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9

An error will occur

The steps of the interpreter can be described in such a sequence.

x = ++x + x++ + x;
x = 2 + x++ + x;
x = 2 + 2 + x;
x = 4 + x;
x = 4 + 3;
x = 7;

https://tc39.es/ecma262/#sec-postfix-increment-operator

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