explain why const is better then function

jrieken · jrieken · commit 65aeaf7fda3a · 2016-07-06T16:09:59.000+02:00
diff --git a/src/vs/base/common/paths.ts b/src/vs/base/common/paths.ts
@@ -229,6 +229,9 @@ export function getRoot(path: string, sep: string = '/'): string {
 }
 
 export const join: (...parts: string[]) => string = function () {
+	// Not using a function with var-args because of how TS compiles
+	// them to JS - it would result in 2*n runtime cost instead
+	// of 1*n, where n is parts.length.
 
 	let value = '';
 	for (let i = 0; i < arguments.length; i++) {

Original file line number	Diff line number	Diff line change
`@@ -229,6 +229,9 @@ export function getRoot(path: string, sep: string = '/'): string {`
`229`	`229`	`}`
`230`	`230`
`231`	`231`	`export const join: (...parts: string[]) => string = function () {`
	`232`	`+ // Not using a function with var-args because of how TS compiles`
	`233`	`+ // them to JS - it would result in 2*n runtime cost instead`
	`234`	`+ // of 1*n, where n is parts.length.`
`232`	`235`
`233`	`236`	`let value = '';`
`234`	`237`	`for (let i = 0; i < arguments.length; i++) {`