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The implementation of enumeration finds all the numbers with 1 in 1-1000 and calculates the number of 1 occurrences_javascript skills

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Release： 2016-05-16 17:22:59

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I was fortunate enough to get a small interview question recently. I studied it and then shared it. I hope it will be helpful to everyone's coding career.

The interview question is: Find all numbers from 1-1000 that appear 1, and count the number of 1 occurrences

Solution:

Copy code The code is as follows:

 
//The enumeration method can only be viewed under Google Chrome
(function () { 
var tmp = []; 
for (var i = 1; i< 1001; i){ 
/1/g.test('' i-1) && tmp.push(i); 
} 
console.log(tmp.length) 

console.log(tmp.reduce(function(i,j) { 
return i j 
})) 

}) () 

The above is the implementation method of enumeration, but it does not work if you go from 1-N, because N may not be how many.

Related labels：

enumerate

source：php.cn

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