}//ForLoop方法__blockintsum =0;doubledate_s =CFAbsoluteTimeGetCurrent();for(inti =0; i < test.count; i ++) { sum+=[test[i] integerValue]; }doubledate_current = CFAbsoluteTimeGetCurrent() -date_s; NSLog(@"Sum : %
You can loop through the array elements with the for loop.The following example outputs all elements in the cars array:Example // Create an array of stringsstring cars[5] = {"Volvo", "BMW", "Ford", "Mazda", "Tesla"};// Loop through stringsfor (int i = 0; i < 5; i++) { ...
vector<int> v1(begin(arr), end(arr)); vector<int> v2(arr->begin(), arr->end()); // Initialize a vector one element at a time. // using a range for loop. Not as efficient as using begin/end. vector<int> v3; for(int i : arr) { v3.push_back(i); } } 下...
鉴于for和for-in都不特别适合在Arrays上循环,因此在ECMAScript 5中引入了辅助方法:Array.prototype.forEach. constarr = ['a','b','c']; arr.prop='property value'; arr.forEach((elem, index) =>{console.log(elem, index); });// Output:// 'a', 0// 'b', 1// 'c', 2 这个方法很方...
再看forEach, 注意forEach调用后直接返回输出 loop end, 间隔2s 后同时输出了后面结果,并没有按预期各个间隔输出。 (asyncfunction(){console.log("foreach loop start ...");fruits.forEach(asyncvalue=>{constelement=awaitgetFruit(value);console.log(element);});console.log("foreach loop end ...")...
甚至这种基于范围的循环（Range-based for loop[1]）写法，包括 C 风格的数组也支持，非常方便。不用...
Tips Theforreference page has a description of how to use:in the context of loop statements. linspaceis similar to the colon operator:, but it gives direct control over the number of points and always includes the endpoints. The sibling functionlogspacegenerates logarithmically spaced values. ...
c = conformalArray; c.ElementPosition = [-1 0 0;-1 0 0;8 0 0]; c.Reference =; c.Element = {dipole(Length=1),tunnel,dipole(Length=1)}; figure show(c) title() Mesh the conformal array. You can control the mesh of individual elements by specifying a vector of edge lengths. ...
Tips Theforreference page has a description of how to use:in the context of loop statements. linspaceis similar to the colon operator:, but it gives direct control over the number of points and always includes the endpoints. The sibling functionlogspacegenerates logarithmically spaced values. ...
- for-of 循环的是val,且只能循环数组,不能循环对象 - forEach 不支持 return 和 break,一定会把所有数据遍历完毕 - for-in 需要穷举对象的所有属性,包括自定义的添加的属性也会遍历,for...in的key是String类型,有转换过程,开销比较大 代码语言:javascript ...