1: Câu lệnh break
• Lệnh break dùng để thoát khỏi vòng lặp mà không đi tới điểm cuối
• Khi gặp câu lệnh này trong vòng lặp, chương trình sẽ thoát ra khỏi vòng lặp và chỉ đến câu lệnh liền sau nó
• Nếu nhiều vòng lặp thì break sẽ thoát ra khỏi vòng lặp gần nhất.
• Ngoài ra, break còn được dùng trong cấu trúc lựa chọn switch
Ví dụ:
for(Student s : listStudent){
code block 1
break;
code block 2
}
Khối lệnh 1 vẫn được thực hiện nhưng khối lệnh 2 thì không vì ta đã đặt break để dừng ngay sau khi thực thi khối lệnh 1
2 : Câu lệnh continue
• Lệnh continue để nhảy qua một phần của khối lệnh và bắt đầu dòng tiếp theo.
• Khi gặp lệnh này trong các vòng lặp, chương trình sẽ bỏ qua phần còn lại trong vòng lặp và tiếp tục thực hiện lần lặp tiếp theo.
Ví dụ:
for (var i = 1; i <= 10; i++){
if (i == 4) {
continue;
}
console.log(i);
}
//output: 1 2 3 5 6 7 8 9 10
Vòng lặp đã bỏ qua giá trị i =4
45 comments On Tìm hiểu về lệnh break và continue trong Javascript
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