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util: refactor format method.Performance improved.
Method format refactored to make it more maintenable, replacing the switch by a function factory, that returns the appropiated function given the character (d, i , f, j, s). Also, performance when formatting an string that contains several consecutive % symbols is improved. The test: `const numSamples = 10000000; const strPercents = '%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%s%%%%%%%%%%%%%%%%%i%%%%%%%%%%%%%%%%%%%%%%%%%%'; var s; console.time('Percents'); for (let i = 0; i < numSamples; i++) { s = util.format(strPercents, 'test', 12); } console.timeEnd('Percents');` Original time: 28399.708ms After refactor: 23763.788ms Improved: 16% PR-URL: #12407 Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com> Reviewed-By: Roman Reiss <me@silverwind.io> Reviewed-By: James M Snell <jasnell@gmail.com> Reviewed-By: Anna Henningsen <anna@addaleax.net> Reviewed-By: Brian White <mscdex@mscdex.net>
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