另一个常用的命令是remove\_from\_collection，它允许我们从指定的collection中移除某个元素。foreach\_in\_collection方法可用于逐个遍历collection中的元素，其工作原理与foreach在list中的遍历相似。在遍历过程中，变量element所保存的也是collection的属性，因此，要打印出这些元素，同样需要借助get_object_name方法。至...
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参数element指定了零个或多个新的参数,添加到列表中那些已被删除的元素的位置处。每个参数element将成为一个单独的列表元素。如果没有指定参数element,则first和last间的元素只是简单地被删除。如果list为空,则任何的参数element被添加到列表的末尾。 例子: 用一个参数element代替列表中的一个元素: %lreplace{a b c...
Syntax: lreplace list first last ?element element ...?. The command returns a new list with elements from first to last replaced by the new elements. Basic List ReplacementThis example demonstrates the simplest usage of lreplace to replace a single element in a list. basic_lreplace.tcl ...
同时,lset所允许的列表索引的最大值为end+1,也就是列表的长度,一旦超出此值就会显示“list index out of range”,如下图所示。 lappend lappend命令可以认为是对列表的一种“续尾”操作,简言之,就是添加的新元素始终被放置在列表的最后一个位置上。lappend与lset一样,直接接收列表变量名,这意味着是对列表的“...
Remove Duplicates from Sorted Array 本题收获: 1.“删除”数组中元素 2.数组输出 题目: Given a sorted array, remove the duplicates in place such that each element appear only once and return the new length. Do not allocate extra space for another array, you must do this i基于...
|list arg1 arg2 ... |创建一个列表 | | |lindex list index |返回列表 list 中的第 index 个元素(element)值 | | |llength list |计算列表 list 元素个数 | | |lrange list index1 index2 |返回指定范围内(从 index1 到 index2)的元素 ...
We use theunsetcommand to remove an element with key 1 from the array. $ ./removing.tcl 6 4 In the beginning, there are 6 elements in the array. After removing two elements, there are 4 elements left. In this part of the Tcl tutorial, we worked with Tcl arrays. ...
If the action is trap, the third element is the command associated with the action. The action `unknown' is returned if a non-Tcl signal handler has been associated with the signal. set Set signals from a keyed list in the format returned by the get. For this action, siglist is the ...
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