for (const key in arr) { console.log(key) } // 0,1,2,3,4 使用for...in可以遍历数组,但是会存在以下问题: index 索引为字符串型数字(注意,非数字),不能直接进行几何运算。 遍历顺序有可能不是按照实际数组的内部顺序(可能按照随机顺序)。 所以一般不建议使用for...in来遍历数组。 for...of
# 自定义列表forloopin12345doecho"loop=$loop"doneexit0deyuy/bin/my_shell >>chmodu+x for1.shdeyuy/bin/my_shell >> ./for1.shloop=1loop=2loop=3loop=4loop=5还可以通过读取文件内容生成变量列表deyuy/bin/my_shell >>vim num.txt12345 6 7 8 #!/bin/bash # Program: # This program will...
JavScript中的循环 循环知识第一部分:重复运行的代码就可以使用循环来解决。JavaScript的重复机制为循环(loop) for:适合重复动作已知次数的循环。...1.初始化(initialization):初始化只在循环开始时发生 2.测试条件(test condition):测试条件检查循环是否要再继续 3.动作(action):循环里的动作就是每一轮循环实际重复...
JavaScript for...in Loop - Learn how to use the for...in loop in JavaScript to iterate over properties of objects effectively.
FOR /R "path" %%variable IN ( Filters of file_type ) DO command The below example provides all the files with the types.txtand.log. Example: @echooffFOR/R"C:\Directory"%%FIN(*.txt *.log)DO(echo%%F)pause Use theFOR /DLoop in Batch Script ...
TypeScript supports the following for loops: for loop for..of loop for..in loop for Loop The for loop is used to execute a block of code a given number of times, which is specified by a condition. Syntax: for (first expression; second expression; third expression ) ...
Syntax of JavaScript for...in Loop for(keyinobject) {// body of for...in}; Here, object- The object whose keys we want to iterate over. key- A variable that stores a single key belonging toobject. Working of for...in Loop
The login node is where the one-hop profiling script will run. We only need ssh, scp and perl on this machine. The compute node is where the actual CUDA application will run and profiled. The profiling data generated will be copied over to the login node, so that it can be used by...
In JavaScript, the for loop is used for iterating over a block of code a certain number of times, or to iterate over the elements of an array. Here's a quick example of the for loop. You can read the rest of the tutorial for more details. Example for (let i = 0; i < 3; i...
ECMAScript (or ES) is a scripting-language specification created to standardize JavaScript. In this example of a for...of loop, we will create an array and print each item in the array to the console. sharks.js // Initialize array of shark species let sharks = [ "great white", "...