如果以下是我的问题数组,如何通过在数组中提供索引值来获取位置[0][2][1]
中的值,例如:answer = [0, 2, 1]
。
var question = [
[
['x', 'x', 'x'],
['x', 'x', 'x'],
['x', 'x', 'x']
],
[
['x', 'x', 'x'],
['x', 'x', 'x'],
['x', 'x', 'x']
],
[
['x', 'x', 'x'],
['x', 'x', 'x'],
['x', 'x', 'x']
]
];
var answer = [0,2,1];
question.get(answer); // Is there a way like this?
有问题,例如question.get(answer)或question.get([0,2,1])?
答案 0 :(得分:1)
这是一种硬编码方式:
question[answer[0]][answer[1]][answer[2]];
或任何长度的数组或嵌套数组:
var question = [
[
['x', 'x', 'x'],
['x', 'x', 'x'],
['x', 'x', 'x']
],
[
['x', 'x', 'x'],
['x', 'x', 'x'],
['x', 'x', 'x']
],
[
['x', 'x', 'x'],
['x', 'x', 'x'],
['x', 'x', 'x']
]
];
var answer = [0,2,1];
var getanswer= function(answerinput,questioninput){
var val = questioninput;
answerinput.forEach(function(item){
val = val[item];
});
return val;
}
console.log(getanswer(answer,question));
答案 1 :(得分:0)
您可以使用Array#reduce
,因为您可以使用question
数组作为输入,并通过迭代给定的answer
数组来获取结果值。
var question = [[['000', '001', '002'], ['010', '011', '012'], ['020', '021', '022']], [['100', '101', '102'], ['110', '111', '112'], ['120', '121', '122']], [['200', '201', '202'], ['210', '211', '212'], ['220', '221', '222']]],
answer = [0, 2, 1],
getItem = function (array, path) {
return path.reduce(function (a, p) { return a[p]; }, array);
};
console.log(getItem(question, answer));

ES6
var question = [[['000', '001', '002'], ['010', '011', '012'], ['020', '021', '022']], [['100', '101', '102'], ['110', '111', '112'], ['120', '121', '122']], [['200', '201', '202'], ['210', '211', '212'], ['220', '221', '222']]],
answer = [0, 2, 1],
getItem = (array, path) => path.reduce((a, p) => a[p], array);
console.log(getItem(question, answer));

答案 2 :(得分:0)
让我们玩得开心......
Object.prototype.getNestedValue = function(...a) {
return a.length > 1 ? (this[a[0]] !== void 0 && this[a[0]].getNestedValue(...a.slice(1))) : this[a[0]];
};
var question = [
[
['1', '2', '3'],
['4', '5', '6'],
['7', '8', '9']
],
[
['a', 'b', 'c'],
['d', 'e', 'f'],
['g', 'h', 'i']
],
[
[':', ',', '?'],
['#', '$', '%'],
['+', '!', '&']
]
];
console.log(question.getNestedValue(...[0,2,1]));
console.log(question.getNestedValue(...[1,2,0]));
console.log(question.getNestedValue(...[2,0,1]));