[英]How to get index of all occurrence of the same value in an Array?
I have two arrays like arr1, arr2. 我有两个数组,如arr1,arr2。 Each array having different kind of values.
每个数组都有不同类型的值。 In array one i have repeated some values in multiple times.
在数组一中,我多次重复一些值。 How can i get same value index and value?
我怎样才能获得相同的价值指数和价值? Also, how to get array two values from array one same value index?
另外,如何从数组中获取数组的两个值相同的值索引?
var arr1 = [100, 200, 100, 300, 600, 200];
var arr2 = [1, 2, 3, 4, 5, 6];
For example, If my custom value is 200. arr1 result will be [1, 5]. 例如,如果我的自定义值为200.arr1结果将为[1,5]。 How to get arr2 value like [2, 6].
如何获得像[2,6]这样的arr2值。
Something like this: 像这样的东西:
var arr1 = [100, 200, 100, 300, 600, 200];
var arr2 = [1, 2, 3, 4, 5, 6];
var _arr1 = [];
var _arr2 = [];
for( var i = arr1.indexOf(200); i >= 0; i = arr1.indexOf(200,i+1) ) {
_arr1.push(i);
_arr2.push( arr2[i] );
}
console.log( _arr1, _arr2 );
I suggest to use Array#filter
with the target array and return true
(later also the value) if the element of array1
with the same index is equal to the search value. 我建议对目标数组使用
Array#filter
,如果具有相同索引的array1
的元素等于搜索值,则返回true
(稍后也是值)。
The
filter()
method creates a new array with all elements that pass the test implemented by the provided function.filter()
方法创建一个新数组,其中包含所有传递由提供的函数实现的测试的元素。
var arr1 = [100, 200, 100, 300, 600, 200], arr2 = [1, 2, 3, 4, 5, 6]; function getMappedValues(array1, array2, value) { return array2.filter(function (_, i) { return array1[i] === value; }); } document.write('<pre>' + JSON.stringify(getMappedValues(arr1, arr2, 200), 0, 4) + '</pre>');
var arr1 = [100, 200, 100, 300, 600, 200];
var obj={};
for(var iloop=0; iloop< arr1.length; iloop++){
if(obj[ arr1[iloop] ]){
obj[ arr1[iloop] ].push(iloop) ;
}else{
obj[ arr1[iloop] ] = [iloop];
}
}
for(var k in obj){
if(obj[k] && obj[k].length>1){
console.log(k, obj[k])
}
}
try 尝试
function findIndexes(arr, value, fromIndex, indexes)
{
indexes = indexes || [];
var index = arr.indexOf(value, fromIndex+1);
console.log(index);
if ( index != -1)
{
indexes.push(index);
findIndexes(arr, value, index, indexes)
}
}
var arr1 = [100, 200, 100, 300, 600, 200];
var arr2 = [];
var value = 200;
findIndexes(arr1, value, -1, arr2);
document.write(arr2);
One way of doing this is go through the array 1 and once find your custom value 一种方法是通过数组1并找到您的自定义值
Here is the code 这是代码
var arr1 = [100, 200, 100, 300, 600, 200];
var arr2 = [1, 2, 3, 4, 5, 6];
var index=[];
var result=[];
var customValue=200;
for(var i=0;i<arr1.length;i++){
if(arr1[i]==customValue){
result.push(arr2[i]);
index.push(i);
}
}
console.log(index);
console.log(result);
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