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1472. Design Browser History

Signed-off-by: rajput-hemant <rajput.hemant2001@gmail.com>

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	`1`	`+package main`
	`2`	`+`
	`3`	`+type BrowserHistory struct {`
	`4`	`+ histories []string`
	`5`	`+ currentPage int`
	`6`	`+}`
	`7`	`+`
	`8`	`+func Constructor(homepage string) BrowserHistory {`
	`9`	`+ return BrowserHistory{`
	`10`	`+ histories: []string{homepage},`
	`11`	`+ currentPage: 0,`
	`12`	`+ }`
	`13`	`+}`
	`14`	`+`
	`15`	`+func (this *BrowserHistory) Visit(url string) {`
	`16`	`+ if this.currentPage != len(this.histories)-1 {`
	`17`	`+ this.histories = append(this.histories[:this.currentPage+1], []string{}...)`
	`18`	`+ }`
	`19`	`+`
	`20`	`+ this.histories = append(this.histories, url)`
	`21`	`+ this.currentPage++`
	`22`	`+}`
	`23`	`+`
	`24`	`+func (this *BrowserHistory) Back(steps int) string {`
	`25`	`+ for i := this.currentPage; 0 <= i; i-- {`
	`26`	`+ if steps == 0 \|\| this.currentPage == 0 {`
	`27`	`+ break`
	`28`	`+ }`
	`29`	`+`
	`30`	`+ this.currentPage--`
	`31`	`+ steps--`
	`32`	`+ }`
	`33`	`+`
	`34`	`+ return this.histories[this.currentPage]`
	`35`	`+}`
	`36`	`+`
	`37`	`+func (this *BrowserHistory) Forward(steps int) string {`
	`38`	`+ lenHistories := len(this.histories)`
	`39`	`+`
	`40`	`+ for i := this.currentPage; i < lenHistories; i++ {`
	`41`	`+ if steps == 0 \|\| this.currentPage == lenHistories-1 {`
	`42`	`+ break`
	`43`	`+ }`
	`44`	`+`
	`45`	`+ this.currentPage++`
	`46`	`+ steps--`
	`47`	`+ }`
	`48`	`+`
	`49`	`+ return this.histories[this.currentPage]`
	`50`	`+}`

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