在javascript数组中合并重复项 [英] merging duplicates in javascript array

问题描述

如果我在JS中有如下数组

if i have a an array like below in 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'
 }]

我如何将其转换为下面的样子

how do i conver it to look like below

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'
 }]

基本上希望基于SKU合并重复项

basically looking to merge duplicates based on SKU

推荐答案

纯JS；快速计算器；

Pure JS; Fast calculator;

<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>

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