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Ilya Kantor 2019-07-01 19:06:32 +03:00
parent 9a7deaeab9
commit a17282b510
3 changed files with 23 additions and 21 deletions
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1-js/05-data-types/03-string/article.md
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@ -340,9 +340,9 @@ It is usually not recommended to use language features in a non-obvious way, but
Just remember: `if (~str.indexOf(...))` reads as "if found".
Technically speaking, numbers are truncated to 32 bits by `~` operator, so there exist other big numbers that give `0`, the smallest is `~4294967295=0`. That makes such check is correct only if a string is not that long.
Technically speaking, numbers are truncated to 32 bits by `~` operator, so there exist other big numbers that give `0`, the smallest is `~4294967295=0`. That makes such check is correct only if a string is not that long.
Right now we can see it only in the old code, as modern JavaScript provides `.includes` method (see below).
Right now we can see this trick only in the old code, as modern JavaScript provides `.includes` method (see below).
### includes, startsWith, endsWith