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- if (condition) {
- let a = 1;
- if (condition2) {
- let b = 2;
- alert(a + b); //тут переменные (a) и (b) видны
- }
- alert(a + b); // ReferenceError: b is not defined //тут переменная (a) видна, а (b) не видна
- }
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