javascript - 从数组中选择在 JavaScript 中没有重复项

Question

我正在编写一个 Discord 机器人。我有一个名为团队的数组，我希望随机分配一个用户一个团队。分配该用户后，我想为下一个用户分配一个团队。

var teams = ["1","1","1","1","1","2","2","2","2","2"];
var heroes = ["a","b","c","d"...etc];

 for (var i = 0; i < 10; i++) {
        var randomHero = Math.floor(Math.random()*heroes.length)
        var randomTeam = Math.floor(Math.random()*teams.length)
        var hero = heroes[randomHero];
        heroes.splice(randomHero)
        var team = teams[randomTeam];
        message.channel.sendMessage(teams);
        teams.splice(randomTeam)
        message.channel.sendMessage(teams);
        message.channel.sendMessage(users[i] + " - " + hero + ' Team ' + team);
        }
    }

但我不确定如何让每个人都得到一个团队，然后删除该元素。它不断提出未定义。

基本上我希望输出是这样的

人 1 - a - 团队 1 人 2 - b - 团队 2 人 3 - e - 团队 2

一直到第 10 个人，所有英雄都是独一无二的，所有队伍均分，第 1 队 5 个，第 2 队 5 个!

Answer 1

你可以使用 Array#splice将一项的第二个参数1作为deleteCount，将拼接后的值移动到变量中。

var teams = ["1", "1", "1", "1", "1", "2", "2", "2", "2", "2"],
    heroes = ["a", "b", "c", "d", "e", "f", "g", "h", "i", "j"],
    randomHero, randomTeam, hero, team;

for (var i = 0; i < 10; i++) {
    randomHero = Math.floor(Math.random() * heroes.length)
    randomTeam = Math.floor(Math.random() * teams.length)
    hero = heroes.splice(randomHero, 1)[0];
    //                   deleteCount / \\\ take from the array the first element
    team = teams.splice(randomTeam, 1)[0];
    console.log(hero + ' Team ' + team);
}
console.log(heroes);
console.log(teams);

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