No idea how common of a use case this is; I personally ran across it when reviewing the source code for marked (specifically the [rtrim method]). That example only does characters, not strings, but it's used in the wild by a package with ~2m weekly downloads on npm.
Of course we wouldn't want `trimStart` to differ from `trimLeft`, they'd all be modified in unison. I just think that symmetry between similar methods is important, and (apparently) has use cases. [rtrim method]: https://github.com/markedjs/marked/blob/master/lib/marked.js#L1493-L1517 On Mon, Jun 24, 2019 at 12:46 AM Jordan Harband <ljh...@gmail.com> wrote: > `trimStart` and `trimEnd` are better-named versions of the very very > long-existing `trimLeft` and `trimRight`, which lack this ability, along > with ES5's `trim`. > > It wouldn't make sense for these three to differ. > > It certainly seems like a potential language proposal to add a string > argument to all three; however, at what point is that reimplementing > `string.replace(/^(foo)+/, '')`, `string.replace(/(foo)+$/, '')`, and > `string.replace(/^(foo)+|$(foo)+$/, '')`? How common is the use case to > trim matching substrings off of the ends of a string? (the use cases for > padding were quite common) > > On Sun, Jun 23, 2019 at 12:14 AM Jacob Pratt <jhpratt...@gmail.com> wrote: > >> `String.prototype.padStart` and `String.prototype.padEnd` accept the >> string to pad with as their final parameter. Is there any particular reason >> `String.prototype.trimStart` and `String.prototype.trimEnd` don't do the >> same? It would be nice to have a parallel, such that `'foo'.padEnd(10, >> 'bar').trimEnd('bar') === 'foo'`. >> >> References: >> - https://github.com/tc39/proposal-string-pad-start-end >> - https://github.com/tc39/proposal-string-left-right-trim >> >> Jacob Pratt >> _______________________________________________ >> es-discuss mailing list >> es-discuss@mozilla.org >> https://mail.mozilla.org/listinfo/es-discuss >> >
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