Iron router function to render templates with the same layout - meteor

Question

In my meteor application I use multiple yields in the layout.
The layout looks like this:
<template name="frontEnd">
{{>yield "header"}}
{{>yield}}
</template>
And the header
<template name="frontEndHeader">
<div class="ui menu">
<a class="active item" href="/">Home</a>
<a class="item" href="admin">Admin</a>
<div class="right menu">
{{>searchPaste}}
</div>
</div>
</template>
In the router.coffee I created a function to render frontEndHeader to prevent hardcoding, because there are many routes that use that template.
Here's the function:
renderFontEnd = (that, template)->
that.layout 'frontEnd'
that.render template
that.render 'frontEndHeader', to : 'header'
The problem is that I need to pass this when I define a route for example:
Router.route '/', ()-> renderFontEnd(#, 'mainUi')
I would like to remove that "()->" before calling the function, how could I do this?
I tried modifying the function to
renderFontEnd = (that, template)->(that=that, template=template)->
that.layout 'frontEnd'
that.render template
that.render 'frontEndHeader', to : 'header'
It doesn't show errors but it renders in nothing (If i add text to the layout it renders it but it doesn't render yields)
I think I'm trying to do this the wrong way.
Thanks for the help
Edit
Adding
console.log #, template
to my renderFrontEnd function, in the browser console I got
Window {speechSynthesis: SpeechSynthesis, caches: CacheStorage, localStorage: Storage, sessionStorage: Storage, webkitStorageInfo: DeprecatedStorageInfo…}Infinity: Infinity$: ( selector, context )Accounts: AccountsClientAnalyserNode: AnalyserNode()AnimationEvent: AnimationEvent()AppBannerPromptResult: AppBannerPromptResult()ApplicationCache: ApplicationCache()ApplicationCacheErrorEvent: ApplicationCacheErrorEvent()Array: Array()ArrayBuffer: ArrayBuffer()Attr: Attr()Audio: HTMLAudioElement()AudioBuffer: AudioBuffer()AudioBufferSourceNode: AudioBufferSourceNode()AudioContext: AudioContext()AudioDestinationNode: AudioDestinationNode()AudioListener: AudioListener()AudioNode: AudioNode()AudioParam: AudioParam()AudioProcessingEvent: AudioProcessingEvent()Autoupdate: ObjectBarProp: BarProp()BatteryManager: BatteryManager()BeforeInstallPromptEvent: BeforeInstallPromptEvent()BeforeUnloadEvent: BeforeUnloadEvent()BiquadFilterNode: BiquadFilterNode()Blaze: ObjectBlob: Blob()BlobEvent: BlobEvent()Boolean: Boolean()Buffer: Buffer(arg)ByteLengthQueuingStrategy: ByteLengthQueuingStrategy()CDATASection: CDATASection()CSS: CSS()CSSFontFaceRule: CSSFontFaceRule()CSSGroupingRule: CSSGroupingRule()CSSImportRule: CSSImportRule()CSSKeyframeRule: CSSKeyframeRule()CSSKeyframesRule: CSSKeyframesRule()CSSMediaRule: CSSMediaRule()CSSNamespaceRule: CSSNamespaceRule()CSSPageRule: CSSPageRule()CSSRule: CSSRule()CSSRuleList: CSSRuleList()CSSStyleDeclaration: CSSStyleDeclaration()CSSStyleRule: CSSStyleRule()CSSStyleSheet: CSSStyleSheet()CSSSupportsRule: CSSSupportsRule()CSSViewportRule: CSSViewportRule()Cache: Cache()CacheStorage: CacheStorage()CanvasCaptureMediaStreamTrack: CanvasCaptureMediaStreamTrack()CanvasGradient: CanvasGradient()CanvasPattern: CanvasPattern()CanvasRenderingContext2D: CanvasRenderingContext2D()ChannelMergerNode: ChannelMergerNode()ChannelSplitterNode: ChannelSplitterNode()CharacterData: CharacterData()ClientRect: ClientRect()ClientRectList: 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HTMLDetailsElement()HTMLDialogElement: HTMLDialogElement()HTMLDirectoryElement: HTMLDirectoryElement()HTMLDivElement: HTMLDivElement()HTMLDocument: HTMLDocument()HTMLElement: HTMLElement()HTMLEmbedElement: HTMLEmbedElement()HTMLFieldSetElement: HTMLFieldSetElement()HTMLFontElement: HTMLFontElement()HTMLFormControlsCollection: HTMLFormControlsCollection()HTMLFormElement: HTMLFormElement()HTMLFrameElement: HTMLFrameElement()HTMLFrameSetElement: HTMLFrameSetElement()HTMLHRElement: HTMLHRElement()HTMLHeadElement: HTMLHeadElement()HTMLHeadingElement: HTMLHeadingElement()HTMLHtmlElement: HTMLHtmlElement()HTMLIFrameElement: HTMLIFrameElement()HTMLImageElement: HTMLImageElement()HTMLInputElement: HTMLInputElement()HTMLKeygenElement: HTMLKeygenElement()HTMLLIElement: HTMLLIElement()HTMLLabelElement: HTMLLabelElement()HTMLLegendElement: HTMLLegendElement()HTMLLinkElement: HTMLLinkElement()HTMLMapElement: HTMLMapElement()HTMLMarqueeElement: HTMLMarqueeElement()HTMLMediaElement: HTMLMediaElement()HTMLMenuElement: HTMLMenuElement()HTMLMetaElement: HTMLMetaElement()HTMLMeterElement: HTMLMeterElement()HTMLModElement: HTMLModElement()HTMLOListElement: HTMLOListElement()HTMLObjectElement: HTMLObjectElement()HTMLOptGroupElement: HTMLOptGroupElement()HTMLOptionElement: HTMLOptionElement()HTMLOptionsCollection: HTMLOptionsCollection()HTMLOutputElement: HTMLOutputElement()HTMLParagraphElement: HTMLParagraphElement()HTMLParamElement: HTMLParamElement()HTMLPictureElement: HTMLPictureElement()HTMLPreElement: HTMLPreElement()HTMLProgressElement: HTMLProgressElement()HTMLQuoteElement: HTMLQuoteElement()HTMLScriptElement: HTMLScriptElement()HTMLSelectElement: HTMLSelectElement()HTMLShadowElement: HTMLShadowElement()HTMLSourceElement: HTMLSourceElement()HTMLSpanElement: HTMLSpanElement()HTMLStyleElement: HTMLStyleElement()HTMLTableCaptionElement: HTMLTableCaptionElement()HTMLTableCellElement: HTMLTableCellElement()HTMLTableColElement: HTMLTableColElement()HTMLTableElement: HTMLTableElement()HTMLTableRowElement: HTMLTableRowElement()HTMLTableSectionElement: HTMLTableSectionElement()HTMLTemplateElement: HTMLTemplateElement()HTMLTextAreaElement: HTMLTextAreaElement()HTMLTitleElement: HTMLTitleElement()HTMLTrackElement: HTMLTrackElement()HTMLUListElement: HTMLUListElement()HTMLUnknownElement: HTMLUnknownElement()HTMLVideoElement: HTMLVideoElement()Handlebars: ObjectHasAndBelongsToManyRelation: HasAndBelongsToManyRelation()HasManyRelation: HasManyRelation()HashChangeEvent: HashChangeEvent()Headers: Headers()History: History()IDBCursor: IDBCursor()IDBCursorWithValue: IDBCursorWithValue()IDBDatabase: IDBDatabase()IDBFactory: IDBFactory()IDBIndex: IDBIndex()IDBKeyRange: IDBKeyRange()IDBObjectStore: IDBObjectStore()IDBOpenDBRequest: IDBOpenDBRequest()IDBRequest: IDBRequest()IDBTransaction: IDBTransaction()IDBVersionChangeEvent: IDBVersionChangeEvent()IIRFilterNode: IIRFilterNode()IdleDeadline: IdleDeadline()Image: HTMLImageElement()ImageBitmap: 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MediaQueryList()MediaQueryListEvent: MediaQueryListEvent()MediaRecorder: MediaRecorder()MediaSource: MediaSource()MediaStreamAudioDestinationNode: MediaStreamAudioDestinationNode()MediaStreamAudioSourceNode: MediaStreamAudioSourceNode()MediaStreamEvent: MediaStreamEvent()MediaStreamTrack: MediaStreamTrack()MessageChannel: MessageChannel()MessageEvent: MessageEvent()MessagePort: MessagePort()Meteor: ObjectMimeType: MimeType()MimeTypeArray: MimeTypeArray()Minimongoid: Minimongoid(attr, parent, is_new)Mongo: ObjectMouseEvent: MouseEvent()MutationEvent: MutationEvent()MutationObserver: MutationObserver()MutationRecord: MutationRecord()NaN: NaNNamedNodeMap: NamedNodeMap()Navigator: Navigator()Node: Node()NodeFilter: NodeFilter()NodeIterator: NodeIterator()NodeList: NodeList()Notification: Notification()Number: Number()Object: Object()OfflineAudioCompletionEvent: OfflineAudioCompletionEvent()OfflineAudioContext: OfflineAudioContext()Option: HTMLOptionElement()OscillatorNode: OscillatorNode()Package: ObjectPageTransitionEvent: PageTransitionEvent()PasswordCredential: PasswordCredential()Paste: Paste()Path2D: Path2D()Performance: Performance()PerformanceEntry: PerformanceEntry()PerformanceMark: PerformanceMark()PerformanceMeasure: PerformanceMeasure()PerformanceNavigation: PerformanceNavigation()PerformanceObserver: PerformanceObserver()PerformanceObserverEntryList: PerformanceObserverEntryList()PerformanceResourceTiming: PerformanceResourceTiming()PerformanceTiming: PerformanceTiming()PeriodicWave: PeriodicWave()PermissionStatus: PermissionStatus()Permissions: Permissions()Plugin: Plugin()PluginArray: PluginArray()PopStateEvent: PopStateEvent()Presentation: Presentation()PresentationAvailability: PresentationAvailability()PresentationConnection: PresentationConnection()PresentationConnectionAvailableEvent: PresentationConnectionAvailableEvent()PresentationConnectionCloseEvent: PresentationConnectionCloseEvent()PresentationRequest: 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SVGFECompositeElement()SVGFEConvolveMatrixElement: SVGFEConvolveMatrixElement()SVGFEDiffuseLightingElement: SVGFEDiffuseLightingElement()SVGFEDisplacementMapElement: SVGFEDisplacementMapElement()SVGFEDistantLightElement: SVGFEDistantLightElement()SVGFEDropShadowElement: SVGFEDropShadowElement()SVGFEFloodElement: SVGFEFloodElement()SVGFEFuncAElement: SVGFEFuncAElement()SVGFEFuncBElement: SVGFEFuncBElement()SVGFEFuncGElement: SVGFEFuncGElement()SVGFEFuncRElement: SVGFEFuncRElement()SVGFEGaussianBlurElement: SVGFEGaussianBlurElement()SVGFEImageElement: SVGFEImageElement()SVGFEMergeElement: SVGFEMergeElement()SVGFEMergeNodeElement: SVGFEMergeNodeElement()SVGFEMorphologyElement: SVGFEMorphologyElement()SVGFEOffsetElement: SVGFEOffsetElement()SVGFEPointLightElement: SVGFEPointLightElement()SVGFESpecularLightingElement: SVGFESpecularLightingElement()SVGFESpotLightElement: SVGFESpotLightElement()SVGFETileElement: SVGFETileElement()SVGFETurbulenceElement: 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SpeechGrammarList()webkitSpeechRecognition: SpeechRecognition()webkitSpeechRecognitionError: SpeechRecognitionError()webkitSpeechRecognitionEvent: SpeechRecognitionEvent()webkitStorageInfo: DeprecatedStorageInfowebkitURL: URL()window: Window__proto__: Window "mainUi"

Answer 1

I'm not 100% sure I understand your question, but it seems you are looking for Function.prototype.bind(). It returns a version of the function with a given this context and optionally some parameters. In your case you can create the bound function like this:
Router.route '/', renderFontEnd.bind(#, 'mainUi')
Now you can modify your renderFrontEnd function like this:
renderFontEnd = (template)->
#layout 'frontEnd'
#render template
#render 'frontEndHeader', to : 'header'
since bind has supplied the correct this context.