Current JavaScript
From ES6 on you could use template strings:
let soMany = 10; console.log(`This is ${soMany} times easier!`); // "This is 10 times easier!
See Kim’s answer below for details.
Older answer
If you really want to do a simple format method on your own, don’t do the replacements successively but do them simultaneously.
Because most of the other proposals that are mentioned fail when a replace string of previous replacement does also contain a format sequence like this:
"{0}{1}".format("{1}", "{0}")
Normally you would expect the output to be {1}{0}
but the actual output is {1}{1}
. So do a simultaneously replacement instead like in fearphage’s suggestion.
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