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util: add fast internal array join method

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PR-URL: https://github.com/nodejs/node/pull/14881
Reviewed-By: Refael Ackermann <refack@gmail.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
This commit is contained in:
Ruben Bridgewater 2017-08-21 23:20:59 -03:00
parent 6bfc439711
commit 01652ccc68
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1 changed files with 15 additions and 0 deletions
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15
lib/internal/util.js
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@ -257,6 +257,20 @@ function promisify(original) {
promisify.custom = kCustomPromisifiedSymbol; promisify.custom = kCustomPromisifiedSymbol;
// The build-in Array#join is slower in v8 6.0
function join(output, separator) {
var str = '';
if (output.length !== 0) {
for (var i = 0; i < output.length - 1; i++) {
// It is faster not to use a template string here
str += output[i];
str += separator;
}
str += output[i];
}
return str;
}
module.exports = { module.exports = {
assertCrypto, assertCrypto,
cachedResult, cachedResult,
@ -270,6 +284,7 @@ module.exports = {
normalizeEncoding, normalizeEncoding,
objectToString, objectToString,
promisify, promisify,
join,
// Symbol used to customize promisify conversion // Symbol used to customize promisify conversion
customPromisifyArgs: kCustomPromisifyArgsSymbol, customPromisifyArgs: kCustomPromisifyArgsSymbol,