Common algorithm questions for front-end interviews in 2018

This time I bring you common algorithm questions for front-end interviews in 2018. What are theprecautionsfor front-end interviews in 2018? Here are practical cases, let’s take a look.

[Related recommendations:Front-end interview questions(2020)]

1ObjectConvert to array

var obj={ 0:'我', 1:'的', 2:'妈', 3:'呀', length:4}//obj格式必须是类似数组的格式（键值是索引，具有length属性）var _slice=[].slice;var objArr=_slice.call(obj);

2. Statistics AstringThe most frequent letters

function countMost(str) { const objCount = {}; str = str.split('').sort().join(''); for(let i=0; i maxValue) { maxStr = []; maxStr.push(p); maxValue = objCount[p]; }else if(objCount[p] == maxValue){ maxStr.push(p); } } return maxStr.length == 1? maxStr[0] : maxStr; }console.log(countMost('afjghdfffffraaaasdddddenas'));

3. Find the maximum difference between the following positive arrays

const arr = [10,5,11,7,8,9];function getMaxProfit(arr) { let max = arr[0], min = arr[0]; for(let i=1; i
      
4. Get the maximum or minimum value in the array
      
function maxAndMin(arr){ return { max:Math.max.apply(null,arr.join(',').split(',')), min:Math.min.apply(null,arr.join(',').split(',')) } }var arr = [22,0,[3,4,2,55]]; maxAndMin(arr).max;// 55maxAndMin(arr).min;// 0
      
5. Generate a random alphanumeric string of specified length
      
function getRandomStr(len) { var str = ""; for( ; str.length < len; str += Math.random().toString(36).substr(2)); return str.substr(0, len); }
      
I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to the php Chinese websiteOthersrelated articles!
      
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