JavaScript數組

Question

在合併重複的，如果我有一個數組像下面的JS

lineitems : [{ 
    quantity : 1, 
    unitPrice : 10.00, 
    unitPriceLessTax: 8.33, 
    SKU: 'SKU123456', 
    productName: 'Blue T-Shirt' 
}, 
{ 
    quantity : 1, 
    unitPrice : 10.00, 
    unitPriceLessTax: 8.33, 
    SKU: 'SKU123456', 
    productName: 'Blue T-Shirt' 
}, 
{ 
    quantity : 1, 
    unitPrice : 48.00, 
    unitPriceLessTax: 40.00, 
    SKU: 'SKU78910', 
    productName: 'Red Shoes' 
}] 

我如何CONVER它看起來像下面

lineitems : [{ 
    quantity : 2, 
    unitPrice : 10.00, 
    unitPriceLessTax: 8.33, 
    SKU: 'SKU123456', 
    productName: 'Blue T-Shirt' 
}, 
{ 
    quantity : 1, 
    unitPrice : 48.00, 
    unitPriceLessTax: 40.00, 
    SKU: 'SKU78910', 
    productName: 'Red Shoes' 
}] 

基本上尋求合併基於SKU

重複

Answer 1

Pu re JS;快速計算器;

<script> 
 
    var lineItems = [{ 
 
    quantity : 1, 
 
    unitPrice : 10.00, 
 
    unitPriceLessTax: 8.33, 
 
    SKU: 'SKU123456', 
 
    productName: 'Blue T-Shirt' 
 
}, 
 
{ 
 
    quantity : 1, 
 
    unitPrice : 10.00, 
 
    unitPriceLessTax: 8.33, 
 
    SKU: 'SKU123456', 
 
    productName: 'Blue T-Shirt' 
 
}, 
 
{ 
 
    quantity : 1, 
 
    unitPrice : 48.00, 
 
    unitPriceLessTax: 40.00, 
 
    SKU: 'SKU78910', 
 
    productName: 'Red Shoes' 
 
}]; 
 

 
var nl =[], i=0; 
 
var collapse = function() 
 
{ 
 
    if (lineItems.length<=i) return; 
 
    if (nl[lineItems[i].SKU]) 
 
    { 
 
     nl[lineItems[i].SKU].quantity+=lineItems[i].quantity; 
 
    } 
 
    else nl[lineItems[i].SKU]=lineItems[i]; 
 
    i++; 
 
    //lineItems.splice(0,1); 
 
    collapse(); 
 
}; 
 
collapse(); 
 
console.log(nl); 
 
var newLineItems = Object.keys(nl).map(function (key) {return nl[key]}); 
 
console.log(newLineItems); 
 
console.log('new line items'); 
 
console.log(lineItems); 
 
</script>

Answer 2

可以使用關聯數組：

var newLineItems = new Array(); 
$.each(lineItems, function (index) { 
    if (newLineItems[this.SKU]) 
     newLineItems[this.SKU].quantity += this.quantity; 
    else 
     newLineItems[this.SKU] = this; 
}); 

Answer 3

使用lodash是一個快速的方法來管理你的集合：

result = _.uniq(lineitems, "SKU"); 

Answer 4

您可以使用Array.prototype.forEach（）

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/forEach

var result = [] 
var temp = []; 
lineitems.forEach(function (element, index, array) { 
    if (temp[element.SKU] === undefined) 
     temp[element.SKU] = element; 
    else 
     temp[element.SKU].quantity += element.quantity; 
}); 
for (var items in temp){ 
    result.push(temp[items]); 
} 

希望這是有用的

丹