javascript 二维数组值交换

Question

我想比较两个数组并将数组值替换为相同的属性值。

let first_array =[{ model: 'aa', size: '85(XS)', count: 200, number: '10-2' },{ model: 'bb', size: '105(XL)', count: 150, number: '' },{ model: 'cc', size: '95(M)', count: 100, number: '9-2' },{ model: 'dd', size: '85(XS)', count: 50, number: '' }]

let second_array = [{ model: 'aa', size: '85(XS)', count: 1, number: '' },{ model: 'bb', size: '105(XL)', count: 1, number: '' },{ model: 'cc', size: '95(M)', count: 2, number: '' },{ model: 'dd', size: '85(S)', count: 3, number: '' },{ model: 'dd', size: '80(XS)', count: , number: '' }]

假设有两个数组。 比较'a'和'b'数组，和'model'一样的'size'把'a'数组的count值插入到'b'数组的count值中，错误的标记为null .

这就是我想要的。

let vlaue = [{ model: 'aa', size: '85(XS)', count: 200, number: '10-2' },{ model: 'bb', size: '105(XL)', count: 150, number: '' },{ model: 'cc', size: '95(M)', count: 100, number: '9-2' },{ model: 'dd', size: '85(XS)', count: 50, number: '' }]

这是我试过的代码。

for (var j = 0; j<second_array.length;j++){

  for(var i = 0; i < first_array.length ;i++){
    var count = false 
    
    if(second_array[j]["model"]+second_array[j]["size"] === first_array[i]){
       
       count = true

    }else{

       count = false

    }

    if(count == true){
        if(objectdata[first_array[i]]["count"] === 0){
          second_array[j]["count"] = ""
          second_array[j]["number"] = ""
        }else{
            second_array[j]["count"] = objectdata[first_array[i]]["count"];
             second_array[j]["number"] = objectdata[first_array[i]]["number"];
        }
        
       
        break
    }else{
        second_array[j]["count"] = ""
        second_array[j]["number"] = ""
    }

} }

Answer 1

  let first_array =[{ model: 'aa', size: '85(XS)', count: 200, number: '10-2' },{ model: 'bb', size: '105(XL)', count: 150, number: '' },{ model: 'cc', size: '95(M)', count: 100, number: '9-2' },{ model: 'dd', size: '85(XS)', count: 50, number: '' }]

  let second_array = [{ model: 'aa', size: '85(XS)', count: 1, number: '' },{ model: 'bb', size: '105(XL)', count: 1, number: '' },{ model: 'cc', size: '95(M)', count: 2, number: '' },{ model: 'dd', size: '85(S)', count: 3, number: '1' }]
 
  let value=[]; 

  for(let i = 0 ; i<first_array.length ; i++){
  
  value.push({
  name:first_array[i].model ? first_array[i].model :second_array[i].model,
  size: first_array[i].size ?first_array[i].size :second_array[i].size,
  count: first_array[i].count ?first_array[i].count :second_array[i].count,
  number: first_array[i].number ?first_array[i].number :second_array[i].number,
  })
  
}
console.log(value)

  let first_array =[{ model: 'aa', size: '85(XS)', count: 200, number: '10-2' },{ model: 'bb', size: '105(XL)', count: 150, number: '' },{ model: 'cc', size: '95(M)', count: 100, number: '9-2' },{ model: 'dd', size: '85(XS)', count: 50, number: '' }]

  let second_array = [{ model: 'aa', size: '85(XS)', count: 1, number: '' },{ model: 'bb', size: '105(XL)', count: 1, number: '' },{ model: 'cc', size: '95(M)', count: 2, number: '' },{ model: 'dd', size: '85(S)', count: 3, number: '1' }]
 
  let value=[]; 

  for(let i = 0 ; i<first_array.length ; i++){
  
  value.push({
  name:first_array[i].model ? first_array[i].model :second_array[i].model,
  size: first_array[i].size ?first_array[i].size :second_array[i].size,
  count: first_array[i].count ?first_array[i].count :second_array[i].count,
  number: first_array[i].number ?first_array[i].number :second_array[i].number,
  })
  
}
console.log(value)

Answer 2

let first_array = [{
  model: 'aa',
  size: '85(XS)',
  count: 200,
  number: '10-2'
}, {
  model: 'bb',
  size: '105(XL)',
  count: 150,
  number: ''
}, {
  model: 'cc',
  size: '95(M)',
  count: 100,
  number: '9-2'
}, {
  model: 'dd',
  size: '85(XS)',
  count: 50,
  number: ''
}]
let second_array = [{
  model: 'aa',
  size: '85(XS)',
  count: 1,
  number: ''
}, {
  model: 'bb',
  size: '105(XL)',
  count: 1,
  number: ''
}, {
  model: 'cc',
  size: '95(M)',
  count: 2,
  number: ''
}, {
  model: 'dd',
  size: '85(S)',
  count: 3,
  number: ''
}, {
  model: 'dd',
  size: '80(XS)',
  count: '',
  number: ''
}]
let desired = [{
    model: 'aa',
    size: '85(XS)',
    count: 200,
    number: '10-2'
  },
  {
    model: 'bb',
    size: '105(XL)',
    count: 150,
    number: ''
  },
  {
    model: 'cc',
    size: '95(M)',
    count: 100,
    number: '9-2'
  },
  {
    model: 'dd',
    size: '85(XS)',
    count: 50,
    number: ''
  }
]

const dict = second_array.reduce((map, {
  model,
  size,
  count,
  number
}) => ({
  ...map,
  [`${model}${size}`]: {
    count,
    number
  }
}), {})

const newArray = first_array.map(({
  model,
  size,
  count,
  number
}) => ({
  model,
  size,
  count: count ?? dict[`${model}${size}`]?.count,
  number: number ?? dict[`${model}${size}`]?.number,
}))

// output:
console.log(newArray)
// desired:
console.log(desired)
// match:
console.log(JSON.stringify(newArray) === JSON.stringify(desired))