Question

我有一个数组

arr = [1,2,3,4,6,7,8,9]

现在我想检查数组中的值是否连续。

更具体，我想要这个

First Check给出第一个和第二个元素是连续的，下一个元素不连续，然后algo必须返回连续数字开始的第一个元素

喜欢

First Check will give 1
Second Check will give 6
and so on...

请帮忙提前致谢

Answer 1

/**
 * Given an array of number, group algebraic sequences with d=1
 * [1,2,5,4,8,11,14,13,12] => [[1,2],[4,5],[8],[11,12,13,14]]
 */
import {reduce, last} from 'lodash/fp';

export const groupSequences = (array) => (
  reduce((result, value, index, collection) => {
    if (value - collection[index - 1] === 1) {
      const group = last(result);
      group.push(value);
    } else {
      result.push([value]);
    }
    return result;
  }, [])(array)
);

Answer 2

一个侧面是你想多次调用它，所以每个调用应该知道它正在处理哪个数组以及该数组中的前一个offset是什么。您可以做的一件事是扩展本机Array对象。的 [Demo]

Array.prototype.nextCons = (function () { var offset = 0; // remember the last offset return function () { var start = offset, len = this.length; for (var i = start + 1; i < len; i++) { if (this[i] !== this[i-1] + 1) { break; } } offset = i; return this[start]; }; })();

<强>用法

var arr = [1,2,3,4,6,8,9]; arr.nextCons(); // 1 arr.nextCons(); // 6 arr.nextCons(); // 8

Answer 3

 /**
 * Given an array of number, group algebraic sequences with d=1
 * [1,2,3,4,5,6] => true
 * [1,2,4,5,6] => false
 */
 const differenceAry = arr.slice(1).map(function(n, i) { return n - arr[i]; })
 const isDifference= differenceAry.every(value => value == 1)
 console.log(isDifference);

Answer 4

伪代码：

int count = 0 
for i = 0 to array.length - 2 
    if  {array[i + 1] - array[i] = 1 then 
        count+=1 
         return i
    else count=0}

Answer 5

const array1 = [1,2,3];
const sum = array1.reduce((accumulator, currentValue) =>{
  return accumulator + currentValue;
});
const max = Math.max(...array1);
  maximum = max
  if(sum == maximum * (maximum+1) /2) {
       console.log(true);
  } else {
       console.log(false);
  }

Answer 6

检查数组中的所有数字是否连续：

   const allConsecutives = (arr) =>{ 
     return arr.every((num, i)=> (arr[i+1]||num+1)-num === 1)
    }

检查数组中的元素是否连续--- javascript

6 个答案: