javascript - js问题求助

问题描述

问 题

var arr = [
    {
        num : 33,
        str: "one"
    },
    {
        num : 34,
        str: "two"
    },
    {
        num : 36,
        str: "three"
    },
    {
        num : 37,
        str: "一"
    },
    {
        num : 42,
        str: "二"
    }
]

想得到

var newarr = [
    ["one","two"],
    ["three","一"],
    ["二"]
]

相邻的放在一个数组里面 33,34 36,37 42 求助js该怎么写

解决方案

其实原理很简单，咱就比比谁代码量少吧。

var arr = [
    {
        num : 33,
        str: "one"
    },
    {
        num : 34,
        str: "two"
    },
    {
        num : 36,
        str: "three"
    },
    {
        num : 37,
        str: "一"
    },
    {
        num : 42,
        str: "二"
    }
];

var nowNum = -1;
var newArr = [];

arr.forEach(function (x) {
  if (x.num === nowNum + 1) {
    newArr[newArr.length - 1].push(x.str);
  } else {
    newArr.push([x.str]);
    nowNum = x.num;
  }
});
console.log(newArr);

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