如何将第6行和第7行从python转换为javascript？

Question

我正在尝试将此功能从python转换为javascript。 但我不知道如何将第6行和第7行的for循环转换为javascript。

async def compute_wn8(stats_totals, exp_stat_totals) -> float:
        """Compute the WN8 of a player."""
        wn8 = 0
        if stats_totals and exp_stat_totals:
            stat_keys = ('dmgs', 'spots', 'kills', 'defs', 'wins')
            dmgs, spots, kills, defs, wins = (stats_totals[stat] for stat in stat_keys)
            exp_dmgs, exp_spots, exp_kills, exp_defs, exp_wins = (exp_stat_totals[stat] for stat in stat_keys)

            r_dmg = dmgs / exp_dmgs if exp_dmgs > 0 else 0
            r_spot = spots / exp_spots if exp_spots > 0 else 0
            r_kill = kills / exp_kills if exp_kills > 0 else 0
            r_def = defs / exp_defs if exp_defs > 0 else 0
            r_win = wins / exp_wins if exp_wins > 0 else 0

            r_dmg_c = max(0., (r_dmg - 0.22) / 0.78)
            r_spot_c = max(0., min(r_dmg_c + 0.1, (r_spot - 0.38) / 0.62))
            r_kill_c = max(0., min(r_dmg_c + 0.2, (r_kill - 0.12) / 0.88))
            r_def_c = max(0., min(r_dmg_c + 0.1, (r_def - 0.10) / 0.90))
            r_win_c = max(0., (r_win - 0.71) / 0.29)

            wn8 += 980 * r_dmg_c
            wn8 += 210 * r_dmg_c * r_kill_c
            wn8 += 155 * r_kill_c * r_spot_c
            wn8 += 75 * r_def_c * r_kill_c
            wn8 += 145 * min(1.8, r_win_c)
        return wn8

这是我走了多远：

async function compute_wn8(stats_totals, exp_stat_totals)
        //Compute the WN8 of a player.
        wn8 = 0
        if(stats_totals && exp_stat_totals){
            stat_keys = ('dmgs', 'spots', 'kills', 'defs', 'wins')
            dmgs, spots, kills, defs, wins = (stats_totals[stat] for stat in stat_keys)
            exp_dmgs, exp_spots, exp_kills, exp_defs, exp_wins = (exp_stat_totals[stat] for stat in stat_keys)

            if(exp_dmgs>0) {r_dmg = dmgs / exp_dmgs} else r_dmg = 0;
            if(xp_spots>0) {r_spot = spots / exp_spots} else xp_spots = 0;
            if(exp_kills > 0) {r_kill = kills / exp_kills} else exp_kills = 0;
            if(exp_defs > 0) {r_def = defs / exp_defs} else exp_defs = 0;
            if(exp_wins > 0) {r_win = wins / exp_wins} else exp_wins = 0;

            r_dmg_c = max(0., (r_dmg - 0.22) / 0.78)
            r_spot_c = max(0., min(r_dmg_c + 0.1, (r_spot - 0.38) / 0.62))
            r_kill_c = max(0., min(r_dmg_c + 0.2, (r_kill - 0.12) / 0.88))
            r_def_c = max(0., min(r_dmg_c + 0.1, (r_def - 0.10) / 0.90))
            r_win_c = max(0., (r_win - 0.71) / 0.29)

            wn8 += 980 * r_dmg_c
            wn8 += 210 * r_dmg_c * r_kill_c
            wn8 += 155 * r_kill_c * r_spot_c
            wn8 += 75 * r_def_c * r_kill_c
            wn8 += 145 * min(1.8, r_win_c)
        return wn8
        }   

但我不知道如何将这两行转换为javascript：

dmgs, spots, kills, defs, wins = (stats_totals[stat] for stat in stat_keys)
exp_dmgs, exp_spots, exp_kills, exp_defs, exp_wins = (exp_stat_totals[stat] for stat in stat_keys)

我希望你们每个人都能帮助我:)

Answer 1

假设您的对象中有stat_totals ，则可以将python理解+解stat_totals转换为javascript map +分解：

 let stats_totals = { dmgs:10, spots:20, kills:30, defs:40, wins:50} let stat_keys = ['dmgs', 'spots', 'kills', 'defs', 'wins'] // dmgs, spots, kills, defs, wins = (stats_totals[stat] for stat in stat_keys) let [dmgs, spots, kills, defs, wins] = stat_keys.map(stat => stats_totals[stat] ) console.log(dmgs, spots, kills, defs, wins) 

在给定对象exp_stat_totals ，另一行也应采用相同的想法。

您也许还可以直接分解对象：

 let stats_totals = { dmgs:10, spots:20, kills:30, defs:40, wins:50} let {dmgs, spots, kills, defs, wins} = stats_totals console.log(dmgs, spots, kills, defs, wins) 

Answer 2

过去，我已经将代码从一种语言转换为另一种语言。 您应该避免直接进行翻译，而应尝试理解代码的功能并进行翻译。 区分什么是逻辑，什么是该语言的特性或实现细节。

尽管Mark Meyer给出了将这些行从字面上转换为JS的答案，并且可以正常工作，但我还是建议不要使用该代码。 在JS中它既复杂又缓慢。

因为与Python理解这些理解不同，JS尚不足够聪明，无法理解stat_keys是属性名称的静态列表，并且无法优化这些Aray＃map调用，然后进行数组销毁。

这就是我翻译您的函数的方式：

// Compute the WN8 of a player.
// why is this function async in your code?
function compute_wn8(stats_totals, exp_stat_totals) {
    if (!stats_totals || !exp_stat_totals) {
        return 0;
    }

    const r_dmg    = exp_stat_totals.dmgs > 0 ? stats_totals.dmgs / exp_stat_totals.dmgs : 0;
    const r_spot   = exp_stat_totals.spots > 0 ? stats_totals.spots / exp_stat_totals.spots : 0;
    const r_kill   = exp_stat_totals.kills > 0 ? stats_totals.kills / exp_stat_totals.kills : 0;
    const r_def    = exp_stat_totals.defs > 0 ? stats_totals.defs / exp_stat_totals.defs : 0;
    const r_win    = exp_stat_totals.wins > 0 ? stats_totals.wins / exp_stat_totals.wins : 0;
    const r_dmg_c  = Math.max(0, (r_dmg - 0.22) / 0.78);
    const r_spot_c = Math.max(0, Math.min(r_dmg_c + 0.1, (r_spot - 0.38) / 0.62));
    const r_kill_c = Math.max(0, Math.min(r_dmg_c + 0.2, (r_kill - 0.12) / 0.88));
    const r_def_c  = Math.max(0, Math.min(r_dmg_c + 0.1, (r_def - 0.10) / 0.90));
    const r_win_c  = Math.max(0, (r_win - 0.71) / 0.29);

    return 980 * r_dmg_c
        + 210 * r_dmg_c * r_kill_c
        + 155 * r_spot_c * r_kill_c
        + 75 * r_def_c * r_kill_c
        + 145 * Math.min(1.8, r_win_c);
}

除此之外，即使在python中，我也不确定

stat_keys = ('dmgs', 'spots', 'kills', 'defs', 'wins')
dmgs, spots, kills, defs, wins = (stats_totals[stat] for stat in stat_keys)
exp_dmgs, exp_spots, exp_kills, exp_defs, exp_wins = (exp_stat_totals[stat] for stat in stat_keys)

r_dmg = dmgs / exp_dmgs if exp_dmgs > 0 else 0
r_spot = spots / exp_spots if exp_spots > 0 else 0
r_kill = kills / exp_kills if exp_kills > 0 else 0
r_def = defs / exp_defs if exp_defs > 0 else 0
r_win = wins / exp_wins if exp_wins > 0 else 0

比这更好（更短，更易读，更快） 。

r_dmg = stats_totals.dmgs / exp_stat_totals.dmgs if exp_stat_totals.dmgs > 0 else 0
r_spot = stats_totals.spots / exp_stat_totals.spots if exp_stat_totals.spots > 0 else 0
r_kill = stats_totals.kills / exp_stat_totals.kills if exp_stat_totals.kills > 0 else 0
r_def = stats_totals.defs / exp_stat_totals.defs if exp_stat_totals.defs > 0 else 0
r_win = stats_totals.wins / exp_stat_totals.wins if exp_stat_totals.wins > 0 else 0

并且，请声明您的变量并使用; 在JS中。 您未来的自我会感谢您。