[英]JavaScript array.sort with multiple values (strings and numbers)
我想按主語 (字符串,字母)排序數組,然后是level (int,ascending) ,然后是name (字符串,字母) 。 我在SO上發現了許多其他線程,但我沒有找到任何多種變量類型 。 我以為我有它,但它沒有正確排序。
排序功能:
scipads.sort(function (a, b) {
if (a.subject != b.subject)
return a.subject < b.subject;
if (a.level != b.level)
return a.level - b.level;
return a.name < b.name;
});
數組:
var scipads = [{
"name": "L2 Physics Externals",
"level": 2,
"subject": "physics",
}, {
"name": "L2 Physics Internals",
"level": 2,
"subject": "physics",
}, {
"name": "L2 Chem Externals",
"level": 2,
"subject": "chemistry",
}, {
"name": "L2 Chem Internals",
"level": 2,
"subject": "chemistry",
}, {
"name": "L2 Bio Internals",
"level": 2,
"subject": "biology",
}, {
"name": "L2 Bio Externals",
"level": 2,
"subject": "biology",
}, {
"name": "L1 Electricity & Magnetism",
"level": 1,
"subject": "physics",
}, {
"name": "L1 Wave Behaviour",
"level": 1,
"subject": "physics",
}, {
"name": "L1 Heat",
"level": 1,
"subject": "physics",
}, {
"name": "L1 Carbon Chemistry",
"level": 1,
"subject": "chemistry",
}, {
"name": "L1 Selected Elements",
"level": 1,
"subject": "chemistry",
}, {
"name": "L1 Chemical Reactions",
"level": 1,
"subject": "chemistry",
},
];
我如何按主題排序,然后是水平,然后命名?
比較應該返回一個整數 。 這是一個例子:
scipads.sort((a, b) => {
if (a.subject != b.subject) {
return a.subject < b.subject ? -1 : 1;
}
if (a.level != b.level) {
return a.level - b.level;
}
return a.name < b.name ? -1 : 1;
})
您的排序比較功能已接近,但尚未完全開啟。 你應該返回-1表示小於0,0表示相等,1表示大於。 請參閱此處獲取文檔
示例:更改return a.subject < b.subject
以return a.subject < b.subject ? -1 : 1;
return a.subject < b.subject ? -1 : 1;
使用localeCompare
比較字符串
var scipads=[{name:"L2 Physics Externals",level:2,subject:"physics"},{name:"L2 Physics Internals",level:2,subject:"physics"},{name:"L2 Chem Externals",level:2,subject:"chemistry"},{name:"L2 Chem Internals",level:2,subject:"chemistry"},{name:"L2 Bio Internals",level:2,subject:"biology"},{name:"L2 Bio Externals",level:2,subject:"biology"},{name:"L1 Electricity & Magnetism",level:1,subject:"physics"},{name:"L1 Wave Behaviour",level:1,subject:"physics"},{name:"L1 Heat",level:1,subject:"physics"},{name:"L1 Carbon Chemistry",level:1,subject:"chemistry"},{name:"L1 Selected Elements",level:1,subject:"chemistry"},{name:"L1 Chemical Reactions",level:1,subject:"chemistry"}]; scipads.sort(function(a, b) { if (a.subject != b.subject) return a.subject.localeCompare(b.subject); else if (a.level != b.level) return a.level - b.level; return a.name.localeCompare(b.name); }); console.log(scipads);
我的解決方案,首先比較主題,然后比較水平
var scipads=[{name:"L2 Physics Externals",level:2,subject:"physics"},{name:"L2 Physics Internals",level:2,subject:"physics"},{name:"L2 Chem Externals",level:2,subject:"chemistry"},{name:"L2 Chem Internals",level:2,subject:"chemistry"},{name:"L2 Bio Internals",level:2,subject:"biology"},{name:"L2 Bio Externals",level:2,subject:"biology"},{name:"L1 Electricity & Magnetism",level:1,subject:"physics"},{name:"L1 Wave Behaviour",level:1,subject:"physics"},{name:"L1 Heat",level:1,subject:"physics"},{name:"L1 Carbon Chemistry",level:1,subject:"chemistry"},{name:"L1 Selected Elements",level:1,subject:"chemistry"},{name:"L1 Chemical Reactions",level:1,subject:"chemistry"}]; // sort by subject, then level, then name var res = scipads.sort((a, b) => { if (a.subject > b.subject) { return 1; } else if (a.subject < b.subject) { return -1; } else if ( a.level > b.level){ return 1; } else if (a.level < b.level) { return -1; } else if (a.name > b.name) { return 1; } else if (a.name < b.name) { return -1; } return 0; }); console.log(res)
要比較字符串,您應該使用string.localeCompare
。 此外,您可以嘗試創建一個具有優先級列表的數組,並在其上循環進行排序。
var scipads=[{name:"L2 Physics Externals",level:2,subject:"physics"},{name:"L2 Physics Internals",level:2,subject:"physics"},{name:"L2 Chem Externals",level:2,subject:"chemistry"},{name:"L2 Chem Internals",level:2,subject:"chemistry"},{name:"L2 Bio Internals",level:2,subject:"biology"},{name:"L2 Bio Externals",level:2,subject:"biology"},{name:"L1 Electricity & Magnetism",level:1,subject:"physics"},{name:"L1 Wave Behaviour",level:1,subject:"physics"},{name:"L1 Heat",level:1,subject:"physics"},{name:"L1 Carbon Chemistry",level:1,subject:"chemistry"},{name:"L1 Selected Elements",level:1,subject:"chemistry"},{name:"L1 Chemical Reactions",level:1,subject:"chemistry"}]; var priority = ["subject", "level", "name"] scipads.sort(function(a,b){ var val = 0; priority.some(function(k){ val = compare(a,b,k); return val !== 0; }); }) function compare(a,b,k){ switch(typeof a[k]){ case "string": return a[k].localeCompare(b[k]); case "number": return a[k] - b[k] } } console.log(scipads)
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