如何将python中的第6行和第7行转换为javascript？

Question

我正在尝试将这个函数从python转换成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

这就是我能做到的：

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代码转换成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)

我希望你们中的任何人都能帮助我：）

Answer 1

我以前把代码从一种语言转换成另一种语言。你应该避免逐字翻译，而是试着理解代码的作用并翻译它。区分什么是逻辑，什么是该语言的特性或实现细节

尽管markmeyer给了你一个答案，可以将这些行逐字翻译成JS，而且它是有效的，但我建议不要使用这些代码。这在JS中是复杂而缓慢的

因为，与理解这些理解的Python不同，JS还不够聪明，无法理解stat_keys是一个静态的属性名列表，无法优化这些Aray#map调用，然后进行数组分解

我就是这样翻译你的函数的：

// 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

比这更好吗

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

请声明变量并在JS中使用;。你未来的自己会感谢你的