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 the precautions for 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 A stringThe most frequent letters
function countMost(str) { const objCount = {};
str = str.split('').sort().join(''); for(let i=0; i<str.length; i++) { let lastIndex = str.lastIndexOf(str[i]);
num = lastIndex - i + 1;
objCount[str[i]] = num;
i = lastIndex;
} let maxStr = [],
maxValue = 1; for(let p in objCount) { if(objCount[p] > 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<arr.length; i++) {
max = Math.max(max,arr[i]);
min = Math.min(min,arr[i]);
} return max - min;
}console.log(getMaxProfit(arr));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;// 05. 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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