Question

考虑这个功能：

function generation(input_text, characters, target_text, mutation_rate, amount_offspring) {
var generationObject = [{string:"", score: 0}];
var evolved_string = "";
var best_offspring = {string:"", score: 0};

for(var i = 0; i <= amount_offspring; i++) {
    evolved_string = evolve(input_text, characters, mutation_rate)
    console.log("E= " + evolved_string);
    generationObject.push({
            string: evolved_string,
            score: score(target_text, evolved_string)
    });
    console.log(generationObject[i]);

    // if there are more then 2 elements in the object array. 
       Check if the current offspring has a higher score then the previous one.
       If it does, its the best offspring
    if (generationObject.length > 1) {
        if (generationObject[i].score > best_offspring.score) {
            best_offspring.string = generationObject[i].string;
            best_offspring.score = generationObject[i].score;
        }
    }
    // if there only is one offspring. Its the best, by defult.
    else {
        best_offspring.string = generationObject[i].string;
        best_offspring.score = generationObject[i].score;
    }

    // increment generations
    generations++;  
    return best_offspring.string;
}

此循环是较大程序http://pastebin.com/tRU1KYP7和http://pastebin.com/MDt3M2s5的一部分，它以字符串作为输入，复制字符串amount_offspring次，同时改变其中一个字符。我的错误是它尝试通过执行evolved_string将score和generationObject推送到.push()数组。

似乎这样做会跳过generationObject[0]。这是为什么？我可以使用任何其他方法添加到我的阵列吗？ THX！

编辑：在这里我做了一个控制台输出，这样你就可以更清楚地看到我的意思了！

functions.js:4 Input= xkt
functions.js:13 Evolved= xkr
functions.js:18 Object {string: "", score: 0}
functions.js:13 Evolved= xks
functions.js:18 Object {string: "xkr", score: 0}
functions.js:13 Evolved= xct
functions.js:18 Object {string: "xks", score: 0}

但是在这里你可以看到functions.js:18 Object {string: "", score: 0}在第一次运行时是这样的。为什么呢？

Answer 1

使用单个对象初始化数组：

var generationObject = [{string:"", score: 0}]; //use var generationObject = []; instead

您的溢出错误来自此处：

i <= amount_offspring; //should be i < amount_offspring, since you start at 0

当我尝试在循环中使用.push时，似乎在间隔号之前开始一个阶段，这似乎会导致溢出？

1 个答案: