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### Lock-based Concurrency Control and Recovery From Failures #### Lesson Introduction: Lock-based Concurrency Control Database systems are equipped with lock-based protocols to ensure that any transaction to a database cannot...

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### Lesson Introduction: ACID Properties ### Topic: Principles of Transactions: ACID Properties ***Atomicity***: - A transaction might commit after completing all its actions, or it could abort after excuting some...

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https://zhuanlan.zhihu.com/p/25321647

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**They all make elements invisible.** *But* - visibility: hidden hides the element, but it still **takes up space in the layout**. display: none removes the element completely from the document....

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Given two integer arrays nums1 and nums2, return an array of their intersection. Each element in the result must appear as many times as it shows in both arrays and...

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**Given an integer array nums, move all 0's to the end of it while maintaining the relative order of the non-zero elements.** *Note that you must do this in-place without...

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**Currying is a useful technique used in JavaScript applications.** **Please implement a curry() function, which accepts a function and return a curried one.** *Here is an example* ```Javascript const join...

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Rotate Array

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**Given an array, rotate the array to the right by k steps, where k is non-negative.** ```Javascript /** * @param {number[]} nums * @param {number} k * @return {void} Do...

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**Given an integer array nums sorted in non-decreasing order, return an array of the squares of each number sorted in *non-decreasing* order.** *Here is O(n) solution because the intuitive version...

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### Call, Apply, Bind - Common - They all used to redirect 'this' keywords - Difference - call & apply will invoke the function, and modify 'this' - **call** passes...

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