[英]array.splice not working correctly in javascript
I'm writing a simple sudoku solver, which takes an array of numbers 1-9 and sets them to null if they are not possible for that cell. 我正在编写一个简单的数独求解器,它使用数字1-9组成的数组,如果该单元格不可能将它们设置为null。 An example is a cell where the answer can only be a 5, so all the numbers are set to null except for five. 一个示例是一个答案只能为5的单元格,因此除5外,所有数字均设置为null。 Then, I have a clean() function which deletes all the values from the array which are null, but that is not working correctly. 然后,我有一个clean()函数,该函数从数组中删除所有为null的值,但不能正常工作。 The original array is this. 原始数组是这个。
[null,null,null,null,5,null,null,null,null]
After being cleaned, it returns 清洗后返回
[null,null,5,null,null]
The javascript code is here, and the grid is the grid of numbers in the sudoku javascript代码在这里,并且网格是数独中的数字网格
function mainmethod(){
var onepos=oneposs();
}
function oneposs(){
var possibs=new Array(1,2,3,4,5,6,7,8,9);
for (var ycount=0;ycount<=8;ycount++){
var value=grid[0][ycount];
var index=possibs.indexOf(value);
possibs[index]=null;
}
// for(var xcount=0;xcount<=8;xcount++){
// var value=grid[xcount][0];
// var index=possibs.indexOf(value);
// possibs.splice(index,1);
// }
possibs=clean(possibs);
alert(JSON.stringify(possibs));
}
function clean(array){
for(var i=0;i<=8;i++){
if(array[i]===null){
array.splice(i,1);
}
}
return array;
}
Essentially, the array.splice is not splicing everything it needs to, and I don't know why 从本质上讲,array.splice不会拼接所需的所有内容,我也不知道为什么
You change the array while you iterate. 您在迭代时更改数组。 Try something like that: 尝试这样的事情:
function clean(array){
for(var i=0;i<=8;i++){
if(array[i]===null){
array.splice(i--,1);
}
}
return array;
}
The --
lower the index because the next item will then be at the same index than the item you are removing. --
降低索引,因为下一个项目将与您要删除的项目处于相同的索引。
Moreover, objects and arrays passed as argument are passed by reference so you don't need to return anything. 而且,作为参数传递的对象和数组都是通过引用传递的,因此您无需返回任何内容。 You can do clean(possibs);
您可以clean(possibs);
That's because when you "splice" the array , the index change. 那是因为当您“拼接”数组时,索引会改变。 Maybe you can try this code : 也许您可以尝试以下代码:
function clean(array){
var x = [];
for(var i=0;i<array.length;i++){
if(array[i]!=null){
x.push(array[i]);
}
}
return x;
}
try this: 尝试这个:
var array = [null,null,null,null,5,null,null,null,null];
for(var i=0;i<=array.length; ){
if(array[i] === null){
array.splice(i,1);
} else if (array.length < 2) {
break;
} else {
i++;
}
}
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