Make multiply(_:_:) function more elegant

jsbean · jsbean · commit 087dc18fdf9d · 2016-11-08T20:48:35.000-05:00
diff --git a/Linear Regression/LinearRegression.playground/Contents.swift b/Linear Regression/LinearRegression.playground/Contents.swift
@@ -34,7 +34,7 @@ func average(_ input: [Double]) -> Double {
 }
 
 func multiply(_ input1: [Double], _ input2: [Double]) -> [Double] {
-    return input1.enumerated().map({ (index, element) in return element*input2[index] })
+    return zip(input1, input2).map { $0.0 * $0.1 }
 }
 
 func linearRegression(_ xVariable: [Double], _ yVariable: [Double]) -> ((Double) -> Double) {

Original file line number	Diff line number	Diff line change
`@@ -34,7 +34,7 @@ func average(_ input: [Double]) -> Double {`
`34`	`34`	`}`
`35`	`35`
`36`	`36`	`func multiply(_ input1: [Double], _ input2: [Double]) -> [Double] {`
`37`		`- return input1.enumerated().map({ (index, element) in return element*input2[index] })`
	`37`	`+ return zip(input1, input2).map { $0.0 * $0.1 }`
`38`	`38`	`}`
`39`	`39`
`40`	`40`	`func linearRegression(_ xVariable: [Double], _ yVariable: [Double]) -> ((Double) -> Double) {`