Javascript string interpolation vs concatenation performance
TL;DRConcatenation is faster and more consistent regarding its speed. But the difference is very little for 1 or 2 variables (below .3 seconds for 100 million calls). Show EditAfter the second run it seems that concatenation is mostly the faster of the two. So, I wanted to expand analog-nico's answer by providing a test that was more extensive and also looked (a bit) into scalability of the two functions. Code on pastebin I decided to use four test cases for each function, having a variable in the front, one at the end, one in the middle and two variables in the middle. The basic setup is the same. I'm just using 100,000,000 iterations of the function and these iterations are run 100 times. I used the same mechanisms to prevent optimization, namely getting the sum of the lengths of the resulting strings and logging it. I also logged the time needed (for me to guess how long it'll take) but also saved it into an array. Afterwards, I calculated the average, minimum, maximum, and standard deviation for each method. Here are the results: values in ResultsIt seems like templates are faster for single variables that are not located at the end of a string, considering that the average is lower and the minimum is lower. If you put a variable at the end of a string or have multiple variables in your string, concatenation is faster. Although the minimum as well as the average of templates is better than their concatenation counterparts regarding the first two conditions, the standard deviation is consistently worse. The difference seems to shrink with more variables (more tests needed). Since most templates won't probably be used for only one variable in a string, it is save to say that sticking to concatenation yields a better performance. But the difference is (at least for now) very marginally. At 100,000,000 (100 million) evaluations with two variables, the difference are merely 273,58 ms, about a quarter second... Second RunThe second run looks somewhat different. Except for the maximum value, average absolute deviation, and standard deviation, every measurement proofed that concatenation is faster than templates. The three mentioned measurements had lower (thus better) values for templates when the variable was at the end of the string or when there were two variables in the string. Here are the results: The code is here What is the difference between string interpolation and concatenation?Concatenation allows you to combine to strings together and it only works on two strings. Swift uses string interpolation to include the name of a constant or variable as a placeholder in a longer string, and to prompt Swift to replace it with the current value of that constant or variable.
Are Backticks slower than other strings in JavaScript?The speed of string literals in JavaScript
He said backtick literals are less performant (in other words, slower) because they need to processed. In other words, the variable interpolation that we want from backtick literals are an Achilles' heel — processing the template literals slows performance.
Are F strings faster than concatenation?Summary: Using the string concatenation operator is slightly faster than using format string literals. Unless you are performing many hundreds of thousands of string concatenations and need them done very quickly, the implementation chosen is unlikely to make a difference.
What is the time complexity of string concatenation JavaScript?String concatenation
It can be a bit surprising, but this code actually runs in O(N2) time. The reason is that in Java strings are immutable, and as a result, each time you append to the string new string object is created.
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