4．自助模式的应用场景持续拓展延伸，半自助模式不断有新玩法涌现近年来，自助模式持续升温，越来越多餐饮品牌通过引入或强化自助提升吸引力。除了传统自助餐的全自助模式以外，近年来越来越多半自助模式涌现。比如起初多见于火锅品牌的小料自助、小菜自助，以及近年来快餐品牌的“3元自助早餐”，半自助的范围逐步扩展至甜品、酒水、蔬菜等特定产品。自助模式的玩法不断细化。
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We now maintain an index variable. Previously, the cursor was always at the right-end of the input, since you couldn't use arrow keys to move it left, and new input was always appended at the right-end. Now, we need to keep a separate index which is not necessarily at the end of the input, and when a user enters a character we splice it into the input in the correct location.