Javascript map object performance

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Javascript map object performance

Javascript map vs object performance benchmark. Javascript map vs object performance.

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evoba eht yfilpmis nac hcihw ,)(seirtnEmorf.tcejbO dna )(seirtne.tcejbO :sdohtem wen owt ecudortni tcejbO was ew ,tsuguA ni 9102SE fo noitatneserp tsrif eht ni ,won tuB ;} ;pam nruter ;)} )]yek[jbo ,yek(tes.pam { >= yek(hcaErof.)jbo(syek.tcejbO ;)(paM wen = pam tsnoc { >= jbo = paMoTjbo tsnoc ;} ;jbo nruter ;)} eulav = ]yek[jbo { >= )eulav

,yek((hcaErof.pam ;}{ = jbo tsnoc { >= pam = jbOoTpam tsnoc :swollof sa ,hcaorppa lanoitcnuf a no yler ot deen yam uoy os ,stcejbo raluger ot paM trevnoc ot tneinevnoc yrev ton llits s'ti ,raf oS ;]pam...[ = rra tsnoc ;)]]2 ,'owt'[ ,]1 ,'eno'[[(paM wen = pam tsnoc :xatnys larutcurts s'6SE esu nac uoy ,yarra na ot kcab paM hctiws oT noisrevnoC epyT

;)]]4 ,'ruof'[ ,]3 ,'eerht'[ ,]2 ,'owt'[ ,]1 ,'eno'[[(paM wen = pam tsnoc ;)]4 ,3 ,2 ,1[(teS wen = tes tsnoc :paM a otni yarra lanoisnemid-owt a trevnoc nac uoy ro ,teS a otni yarra na trevnoc nac uoy sa tsuj ,eulav/yek hguorht sriap ni raeppa spaM taht si ecnereffid tseggib ehT It's more appropriate than a normal object. Therefore, there must be a threshold

for measuring space and speed. This means that they behave slightly differently and are used in specific contexts, offering considerable performance advantages. Links to the original text A?¡Àadido by fooDigi el Mar, 13 Aug 2019 10:15:22 +0300 console.log (isAnagram (? ? ? anagram', ? ? ? gramana'); // Must return true console.log (isAnagram (? ? ?

anagram', ? ? ? margin'); // Must return false There are many ways to do this, but here, map can help us create the simplest and ? solution: const isAnagram = (str1, str2) => { if (str1.length != str2.length) { returns false; } const map = new Map (); for (let's leave str1 char) { const count = map.has (char)? This result is surprising, but without a for

loop, map attributes better than normal objects. query let result; console.time (? ? Object'); result = obj.hasOwnProperty (? ? 99 ?999 999'); console.timeEnd (? ? ? Object'); // Object: 0.250ms console.time (? ? Map'); result = map.has (99 999 999); console.timeEnd (? ? ? Map'); // Map: 0.095ms (2.6 times faster) A?¡Àadir a console.time (? ? Object'); obj[n] = n;

console.timeEnd (? ? Object?'); // Object: 0.229ms console.time (? ? ? Map'); map.set (n, n); console.timeEnd (? ? ? Map'); // Map: 0.005ms (45.8 times faster!) delete console.time (? ? Object'); remove obj[n]; console.timeEnd (? ? Object?'); // Object: 0.376ms console.time (? ? ? Map'); map.delete (n); console.timeEnd (? ? ? Map'); // Map: 0.012ms (31 times faster)

Cu? ndo is slower In tests, I discovered that in one case, regular objects work better: use loops to create regular objects and maps. Translator's note: I personally disagree with the author's point of view. 2. The map can be crossed directly, and as it is a set of keys, the order of the cross?a is the same as that of the insertion ? keys. The following object

,paM ,paM ;} '3eulav??? :]lobmys[ ,'2eulav??? :]2gnirts[ ,'1eulav??? :1gnirts { = tcejbOraluger tsnoc ;'2gnirts??? = 2gnirts tsnoc ;)( lobmyS = lobmys tsnoc :otnup etse contrast, allows you to use functions, objects, and other simple types (including NaN) as keys, as follows: const func = () => null; const object = {}; const array = []; const bool = false; const

map = new Map (); map.set (func, ? ? ? value1'); map.set (object, ? ? ? value2'); map.set (array, ? ? ? value3'); map.set (bool, ? ? ? value4'); map.set (NaN, ? ? ? value5'); This feature provides great flexibility in linking different types of data. Maps behave very similar to Sets, and all contain the same numbers: has, get, set, delete. Both are sets of keys, which

means that you can traverse elements using m?? all as forEach, in order of insertion keys ? n. In this article analyze?? Map, how ? is different, where ? can be used and what performance advantages it has over conventional objects. You've signed on to another pesta or window. You have started ? with another pesta?¡Àa or window. When the amount

of data is small, the cost of space is higher than that of speed. The test results demonstrate the performance advantages of using Map, especially when adding and removing key values. Unlimited key The key for a regular JavaScript object must be a String or Symbol. So how do developers measure the relationship between the two and ? the best

solution?? The Map and regular objects have two main differences. let obj = {}, map = new Map(), n = 1000000; for (let i = 0; i < n; (i++) { obj[i] = i; map.set(i, i); } Then I use console.time() to measure the test, because of my particular system and the version? n of Node.js, the accuracy? n of the time can fluctuate. If you haven't used Map before,

you can broaden its horizon and measure the value of modern JavaScript. "What is the difference between the map and the whole? loopback, since a regular object can't go through directly, and there are some limitations to the for... What is the difference between a Map and objeto regular? map.get (char) + 1: 1; map.set (char, count); } for (dejemos

char de str2) { if (!map.has (char)) { devuelve false; } } Count = map.get (char) ? € "1; If (Count === 0) {map.delete (char); Continue; } Map.Set (Char, Count); } Returns Map.Size === 0; }; In this example, MAP is more appropriate than Object when it implies adding and eliminating key values ?and does not confirm the data structure (or the

number of key values) beforehand. Loop: Only crosses the enumerable belongings. Direct crossing in a regular object, to go through keys, values ?and entries, you must convert them into arrays, such as using object.keys (), object.values ?(), and object.entries (), or ... sex, attributes no Symbolics, and the order of the crossing is arbitrary. Share instantly

code, notes and fragments. You can use the one for ... When introducing the new JavaScript features in ES6, we saw the introduction of Set and Map. Unlike regular and array objects, they are ?key collections?. From the entire loop or foreach to cross the map entries, as follows: for (leave [key, value] on the map) {console.log (key); }; map.foreach

((key, value) => {console.log (key); Console.log (value);}); Another advantage is that you can call the Map.Size property to get the number of keys, while for regular objects, you first have to convert to an array, and then get the length of the array, such as: object.keys ({}) .length From the previous description, MAP is more than a compensation

between space and speed. 1. Obviously it is not appropriate to use MAP at this time. Node / JavaScript Performance: Set vs Object and Map vs Object can not perform this action at this time. Time

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