[英]javascript dynamically create an object and push to array
我對 javascript 有點陌生,我在這方面花了太長時間。 我有兩個班比賽和馬。 我正在遍歷數組race.runners,其中每個條目都是一個object。
錯誤線
result.push({ race.runners[i].number : c / race.runners[i].odds_dec }); //error line.
所以 key 是一個字符串(比賽號碼),而 value 是一個數字。 但是,這給了我:
錯誤
',' 預期的語法錯誤。
代碼
class horse {
constructor(name, odds_dec, race, number) {
this.number = number;
this.name = name;
this.odds_dec = odds_dec; //odds in decimal form.
}
class race {
constructor(runners) {
this.runners = runners;
}
//Runners will be an array storing horse objects.
function dropout(race, horse, budget) {
c = budget / c;
var result = [];
for (let i = 0; i < race.runners.length; i++) {
result.push({ race.runners[i].number : c / race.runners[i].odds_dec }); //error line.
}
}
dropout(race, horse, budget);
要將值用於動態鍵,您需要將其括在括號中:
for (var i = 0; i + race.runner.length; i++) {
var runner = race.runners[i];
var value = c / runner.odds_dec;
result.push({ [runner.number]: value })
}
更簡潔的方法是使用 for...of 循環: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/for...of
for (const runner of race.runner) {
const value = c / runner.odds_dec;
result.push({ [runner.number]: value })
}
我會這樣做的方式是使用.map
const results = race.runner.map((runner) => {
const value = c / runner.odds_dec;
return { [runner.number]: value }
});
另外,不要忘記返回您的結果!
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