CODEWITHSUNDEEP
javascriptarrays
mtch9
mtch9

Reputation: 308

Finding the highest number of elements in arrays

I want to find the longest array and get his length.

This is array: 

 [["667653905", "Johjn", "Smith"], ["500500500", "John", "Smith2", "Another field"], ["12342312", "asd", "asdasd", "fghfgh", "fghfgh"]]

Currently i am using loop but this is very slow solution if i have 50k arrays:

for(var i = 0; i<explode.length; i++) {
        console.log(explode[i].length);
    }

Upvotes: 0

Views: 76

Answers (3)

Haoyu Chen
Haoyu Chen

Reputation: 1810

Just a complement to the answer above. If the array is 50K or more, it may be better to consider moving the code into the backend firstly. In that case, it could be done by java or other low level languages, or even using parallel programming solution. The speed will be increased dramatically.

Upvotes: 3

lockedz
lockedz

Reputation: 243

You could only make an assignment (or output) fewer times, to boost it up.

Although I'm not a hundred percent sure the if () would actually be faster than other aproach (as the use of reduce() [don't know it's implementation]), try this implementation with the 50k array:

var max = 0;
var explode = new Array();

explode = [["667653905", "Johjn", "Smith"],
 ["500500500", "John", "Smith2", "Another field"], 
 ["12342312", "asd", "asdasd", "fghfgh", "fghfgh"]];

var explodeSize = explode.length;
for (var i = 0; i<explodeSize; i++) {
    if (max < explode[i].length) {
        max = explode[i].length;
    }
}
console.log(max);

Upvotes: 0

Pointy
Pointy

Reputation: 413720

You can find the longest array with .reduce()

var longest = theArray.reduce(function(lsf, a) {
    return !lsf || a.length > lsf.length ? a : lsf;
}, null);
console.log("longest array has " + longest.length + " elements");

Upvotes: 4

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