importjava.util.OptionalInt;importjava.util.stream.IntStream;publicclassStreamArrayIndexFinder{publicstaticOptionalIntfindIndex(int[]array,inttarget){returnIntStream.range(0,array.length).filter(i->array[i]==target).findFirst();}publicstaticvoidmain(String[]args){int[]array={1,2,3,4,5};inttar...
In the above example, we have used thefindIndex()method to find the index of the first even number in thenumbersarray. isEven()is a function that returns an even number. We have passedisEven()as a callback in thefindIndex()method as-numbers.findIndex(isEven). The method returns2which ...
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查询类 indexof lastIndexOf findIndex() find() includes Array.isArray() indexOf 找到数组中指定字符首次出现的索引,需要传参,不会改变原数组,返回位置的索引,找不到返回-1 lastIndexOf 找到数组中指定字符末次出现的索引,找不到返回 -1 findIndex 能够返回符合 callback 条件的那一项的索引, 不改变原数组...
Write a Java program to find the index of a value in a sorted array. If the value does not find return the index where it would be if it were inserted in order. Example: [1, 2, 4, 5, 6] 5(target) -> 3(index) [1, 2, 4, 5, 6] 0(target) -> 0(index) ...
1publicstaticvoidmain(String[] args) {2int[] arr = {6, 5, 3, 2, 4};34for(inti = 0; i < arr.length; i++) {5//默认第一个是最小的6intmin =arr[i];7//记录最小的下标8intindex =i;9//通过与后面的数据进行比较得出,最小值和下标10for(intj = i + 1; j < arr.length; j...
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findIndex() findIndex()返回数组中符合条件的第一个元素的索引,没有,则返回-1。 语法 代码语言:txt AI代码解释 arr.findIndex((element,index,array), thisArg) element: 当前元素 index: 当前元素索引 可选 array: 数组本身 可选 thisArg: 执行回调时用作this的对象。 可选 代码语言:javascript 代码运行...
1.Array.indexOf() --推荐,Array.indexOf("x")== -1,则不包含,不返回-1 则包含 2.Array.find() 3.Array.findIndex() 4.for 或foreach循环,然后 if 判断 1.Array.indexOf() varbeasts = ['ant','bison','camel','duck','bison'];console.log(beasts.indexOf('bison'));// expected output...
indexOf()命令返回在该给定元素可以在阵列中可以发现,或-1,如果它不存在的第一个索引。这可以与splice()一起使用来搜索元素然后将其删除,即使您不知道它在数组中的位置。 让我们删除“foo”元素: ["bar", "baz", "foo", "qux"] list.splice( list.indexOf('foo'), 1 );// Find the index position...