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【JavaScript】【Jquery】配列操作 map文 eachよりも優れてる?

Last updated at Posted at 2023-07-26

//varを使用すると再宣言、初期化によるバグを起こしやすくなるため、今は非推奨だから使わないほうが良い

let results = [
    {'name' : '田中',  'japanese' : 83, 'math' : 57, 'science' : 43,  'social' : 72, 'english' : 78},
    {'name' : '渡部',  'japanese' : 62, 'math' : 88, 'science' : 70,  'social' : 66, 'english' : 38},
    {'name' : '品川',  'japanese' : 23, 'math' : 33, 'science' : 53,  'social' : 17, 'english' : 07},
    {'name' : '滝谷',  'japanese' : 93, 'math' : 89, 'science' : 79,  'social' : 96, 'english' : 91},
    {'name' : '川原田','japanese' : 55, 'math' : 56, 'science' : 60,  'social' : 54, 'english' : 66},
    {'name' : '一色',  'japanese' : 27, 'math' : 47, 'science' : 100, 'social' : 42, 'english' : 38},
];

let result = $.map(results, function(e) {
  return e.name;
});

console.log(result);

let array = [100, 110, 120, 130, 140, 150];
let new_array = $.map(array, function(num) {
  return num + 10;
});

console.log(new_array);

結果

[ "田中" , "渡部" , "品川" , "滝谷" , "川原田" , "一色" ]

[110, 120, 130, 140, 150, 160]

DOM操作の場合

<input type="checkbox" name="sports" value="野球">野球
<input type="checkbox" name="sports" value="サッカー">サッカー
<input type="checkbox" name="sports" value="バスケットボール">バスケットボール
let sports = $('input[type="checkbox"]').map(function(){
    return this.value;
}).get();

let sports = $('input[type="checkbox"]').map((_,e) => e.value).get();

console.log(sports);

結果

["野球", "サッカー", "バスケットボール"]
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