在 Javascript 中查找多维数组的索引
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原文地址: http://stackoverflow.com/questions/16102263/
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To find Index of Multidimensional Array in Javascript
提问by Rayon
I have created a multidimensional array in JavaScript and I want to find the exact index of specific value. That value will be user input.
我在 JavaScript 中创建了一个多维数组，我想找到特定值的确切索引。该值将是用户输入。
var array=[];
for(var i=0;i<10;i++)
{
array[i] = [];
for(var j=0;j<100;j++)
{
k = k +1
array[i].push(k);
}
}
var index=array.indexOf(**"What to insert here???"**);
回答by Du D.
JSFiddle
JSFiddle
/**
* Index of Multidimensional Array
* @param arr {!Array} - the input array
* @param k {object} - the value to search
* @return {Array}
*/
function getIndexOfK(arr, k) {
for (var i = 0; i < arr.length; i++) {
var index = arr[i].indexOf(k);
if (index > -1) {
return [i, index];
}
}
}
// Generate Sample Data
var k = 0;
var array = [];
for (var i = 0; i < 10; i++) {
array[i] = [];
for (var j = 0; j < 100; j++) {
k = k + 1;
array[i].push(k);
}
}
var needle = 130;
var result = getIndexOfK(array, needle);
console.log('The value #' + needle + ' is located at array[' + result[0] + '][' + result[1] + '].');回答by Alberto Fecchi
this example seems to work well also with IRREGULAR multidimentional array:
这个例子似乎也适用于 IRREGULAR 多维数组：
function findIndex(valueToSearch, theArray, currentIndex) {
if (currentIndex == undefined) currentIndex = '';
if(Array.isArray(theArray)) {
for (var i = 0; i < theArray.length; i++) {
if(Array.isArray(theArray[i])) {
newIndex = findIndex(valueToSearch, theArray[i], currentIndex + i + ',');
if (newIndex) return newIndex;
} else if (theArray[i] == valueToSearch) {
return currentIndex + i;
}
}
} else if (theArray == valueToSearch) {
return currentIndex + i;
}
return false;
}
var a = new Array();
a[0] = new Array(1, 2, 3, 4, 5);
a[1] = 'ciao';
a[2] = new Array(new Array(6,7),new Array(8,9),10);
var specificIndex = findIndex('10', a);
i wrote this speedly so everyone is invited to improve this function!
我写的很快，所以请大家改进这个功能！
p.s. now the function returns a STRING value with all indexes separated by comma, you can simply edit it to returns an object
ps 现在该函数返回一个字符串值，所有索引以逗号分隔，您可以简单地编辑它以返回一个对象
回答by Xotic750
On jsfiddle
function indexOf2d(arr, val) {
var index = [-1, -1];
if (!Array.isArray(arr)) {
return index;
}
arr.some(function (sub, posX) {
if (!Array.isArray(sub)) {
return false;
}
var posY = sub.indexOf(val);
if (posY !== -1) {
index[0] = posX;
index[1] = posY;
return true;
}
return false;
});
return index;
}
console.log(indexOf2d(array, 50));
回答by PedroProgrammer
My code does like a PROCV in MS Excel... and identifies the Index searching only in the first column. Maybe help you (or others).
我的代码确实像 MS Excel 中的 PROCV... 并且仅在第一列中标识索引搜索。也许可以帮助您（或其他人）。
var convertToRoman = function (valueLimitTen) {
var convertTable = [ [1, "I"],
[2, "II"],
[3, "III"],
[4, "IV"],
[5, "V"],
[6, "VI"],
[7, "VII"],
[8, "VIII"],
[9, "IV"],
[10, "X"],
];
var myIndex;
for(var i in convertTable){
if(convertTable[i][0] == valueLimitTen){
myIndex = i;
return convertTable[i][1];
}
}
}
console.log(convertToRoman(2)); //Result II
console.log(convertToRoman(10)); //Result X
