我知道 JavaScript 中的 unshift() 和push() 方法之间有什么区别,但我想知道时间复杂度有什么区别? 我想push() 方法是 O(1) 因为你只是在数组的末尾添加一个项目,但我不确定 unshift() 方法,因为,我想您必须向前“移动”所有其他现有元素,我想那是 O(log n) 还是 O(n)? 原文由 dperitch 发布,翻译遵循...
据我所知，JavaScript语言规范并没有规定这些函数的时间复杂度。
上面没有考虑数组的顺序，如果你想正确比较它们，你必须反转push数组，但是push then reverse在chrome上...
Insertion:push()はunshift()より早い。 Removal:pop()はshift()より早い。 Searching:O(n) Access:O(1) Built-in Methods push():O(1) pop():O(1) shift():O(n)*reindex unshift():O(n)*reindex sort():O(n log n) ... Explore examples 一般的な事例 さらに複雑な事例 端的な事例 空(...
arr.length+1)}else{// 在数组前面插入元素arr.unshift(arr.length+1)}constend=newDate().getTime...
正如push所解释的那样，当大小用完时，最终会有一个"分配内存和复制"。使用unshift，它想在start上加...
The difference for the immutable collections is that methods which would mutate the collection, like push, set, unshift or splice, instead return a new immutable collection. Methods which return new arrays, like slice or concat, instead return new immutable collections....
The difference for the immutable collections is that methods which would mutate the collection, like push, set, unshift or splice, instead return a new immutable collection. Methods which return new arrays, like slice or concat, instead return new immutable collections....
a.unshift(item1[, item2[, ...[, itemN]]]) Prepends items to the start of the array. Functions Along with objects, functions are the core component in understanding JavaScript. The most basic function couldn't be much simpler: 1 2 3 4 function add(x, y) { var total = x + y;...
We can sum up the arrays time complexity as follows: Array Time Complexities OperationWorst Access (Array.[]) O(1) Insert head (Array.unshift) O(n) Insert tail (Array.push) O(1) Search (for value) O(n) Delete (Array.splice) O(n) HashMaps Maps, dictionaries, an...