如何基于第一个array1或基本按array1组合数组的数组。
下面是四个数组,我必须在其中形成基于A的对象,然后基于B的对象。
var array1=["A","B"];
var array2=["1","2","3", "4"];
var array3=["N","O","P", "Q"];
var array4=["R"];
下面是我的需要:
[ {
'take': 'A',
'take2': '1',
'take3': 'N',
'take4': 'R'
}, {
'take': 'A',
'take2': '2',
'take3': 'N',
'take4': 'R'
}, {
'take': 'A',
'take2': '3',
'take3': 'N',
'take4': 'R'
}, {
'take': 'A',
'take2': '4',
'take3': 'N',
'take4': 'R'
}, {
'take': 'A',
'take2': '1',
'take3': 'O',
'take4': 'R'
}]
这是我尝试过的方法,但不确定如何循环n个n个数组
var result = array1.reduce( (a, v) =>
[...a, ...array2.map(x=>v+x)],
[]);
答案 0 :(得分:3)
这是一个简单的解决方案(如果您知道有多少个数组):
const possibilities = [];
const ar1length = array1.length;
const ar2length = array2.length;
const ar3length = array3.length;
const ar4length = array4.length;
// Not cleanest solution available but it does the job
for ( let i = 0; i < ar1length; i++) {
for (let j = 0; j < ar2length; j++) {
for (let k = 0; k < ar3length; k++) {
for (let l = 0; l < ar4length; l++) {
possibilities.push({
"take": array1[i],
"take1": array2[j],
"take2": array3[k],
"take3": array4[l]
});
}
}
}
}
哦,如果您想要未知数量的数组,可以将所有这些数组添加到数组中,以便对其进行迭代
答案 1 :(得分:1)
前段时间我已经为此任务编写了一个函数,它接受任意数量的数组和非数组并计算所有可能的组合
var array1 = ["A", "B"];
var array2 = ["1", "2", "3", "4"];
var array3 = ["N", "O", "P", "Q"];
var array4 = ["R"];
console.log(combinations(array1, array2, array3, array4).join("\n"));
function combinations(...columns) {
const state = [], combinations = [state];
let head = null;
for (let column = 0; column < columns.length; ++column) {
let value = columns[column];
if (Array.isArray(value)) {
if (value.length > 1) {
head = {
next: head,
column,
row: 0
};
}
value = value[0];
}
state[column] = value;
}
let todo = head;
while(todo) {
if (++todo.row === columns[todo.column].length) {
todo.row = 0;
state[todo.column] = columns[todo.column][todo.row];
todo = todo.next;
} else {
state[todo.column] = columns[todo.column][todo.row];
combinations.push(state.slice());
todo = head;
}
}
return combinations;
}
.as-console-wrapper{top:0;max-height:100%!important}
答案 2 :(得分:1)
这是一种递归方法,适用于每一个数组,只需调用combine(array1, array2, ..., arrayn)
:
var array1=["A","B"];
var array2=["1","2","3", "4"];
var array3=["N","O","P", "Q"];
var array4=["R"];
function combine(arr1, ...arr2) {
if(arr2.length === 0) return Array.from(arr1, (x) => x.reduce((obj, y, i) => (obj[`take${i}`] = y, obj), {}));
return combine(arr1.flatMap(d => arr2[0].map(v => {
return [...Object.values(d), ...Object.values(v)]
})), ...arr2.slice(1));
}
console.log(combine(array1, array2, array3, array4));