Add a Number to Two Variables At Once

PHOTO

Fri May 01 2020 11:34:52 GMT+0000 (Coordinated Universal Time)

 foo += -bar + (bar += 5);
// foo and bar are now 15

COPY

The -bar gets parsed and becomes the negative value of bar, so -10. Then, a += 5 runs and sets bar to 15 (10 + 5). Finally, it sums up both values (-10 + 15) and gives you the difference between old bar and new bar, which is 15.

https://css-tricks.com/snippets/javascript/add-number-two-variables/

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Add a Number to Two Variables At Once

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