Why can I do this in Dart but not in JS

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Sun Jun 20 2021 07:26:48 GMT+0000 (Coordinated Universal Time)

Saved by @jmo ##dart ##js

//Dart: can multiply string with number
print('x' * 5) // 'xxxxx';

//JS: cannot multiply string with number
console.log('x' * 5) // NaN;
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