fix(guide): simplify directory structure

guide/english/javascript/standard-objects/function/function-caller/index.md

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+---
+title: Function Caller
+---
+## Function Caller
+
+This is a stub. <a href='https://github.com/freecodecamp/guides/tree/master/src/pages/javascript/standard-objects/function/function-caller/index.md' target='_blank' rel='nofollow'>Help our community expand it</a>.
+
+<a href='https://github.com/freecodecamp/guides/blob/master/README.md' target='_blank' rel='nofollow'>This quick style guide will help ensure your pull request gets accepted</a>.
+
+<!-- The article goes here, in GitHub-flavored Markdown. Feel free to add YouTube videos, images, and CodePen/JSBin embeds  -->
+
+#### More Information:
+<!-- Please add any articles you think might be helpful to read before writing the article -->
+
+

guide/english/javascript/standard-objects/function/function-displayname/index.md

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+---
+title: Function displayName
+---
+## Function displayName
+
+This is a stub. <a href='https://github.com/freecodecamp/guides/tree/master/src/pages/javascript/standard-objects/function/function-displayname/index.md' target='_blank' rel='nofollow'>Help our community expand it</a>.
+
+<a href='https://github.com/freecodecamp/guides/blob/master/README.md' target='_blank' rel='nofollow'>This quick style guide will help ensure your pull request gets accepted</a>.
+
+<!-- The article goes here, in GitHub-flavored Markdown. Feel free to add YouTube videos, images, and CodePen/JSBin embeds  -->
+
+#### More Information:
+<!-- Please add any articles you think might be helpful to read before writing the article -->
+
+

guide/english/javascript/standard-objects/function/function-length/index.md

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+---
+title: Function Length
+---
+## Function Length
+
+The `length` property on the function object holds the number of arguments expected by the function when called.
+
+```javascript
+
+function noArgs() { }
+
+function oneArg(a) { }
+
+console.log(noArgs.length); // 0
+
+console.log(oneArg.length); // 1
+```
+
+### ES2015 Syntax
+
+ES2015, or ES6 as it is commonly called, introduced the rest operator and default function parameters. Both of these additions change the way the `length` property works.
+
+If either the rest operator or default parameters are used in a function declaration the `length` property will only include the number of arguments before a rest operator or a default parameter.
+
+```javascript
+function withRest(...args) { }
+
+function withArgsAndRest(a, b, ...args) { }
+
+function withDefaults(a, b = 'I am the default') { }
+
+console.log(withRest.length); // 0
+
+console.log(withArgsAndRest.length); // 2
+
+console.log(withDefaults.length); // 1
+```
+
+More Information on `Function.length` can be found on [Mozilla's MDN Docs](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/length).
+

guide/english/javascript/standard-objects/function/function-name/index.md

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+---
+title: Function Name
+---
+## Function Name
+
+This is a stub. <a href='https://github.com/freecodecamp/guides/tree/master/src/pages/javascript/standard-objects/function/function-name/index.md' target='_blank' rel='nofollow'>Help our community expand it</a>.
+
+<a href='https://github.com/freecodecamp/guides/blob/master/README.md' target='_blank' rel='nofollow'>This quick style guide will help ensure your pull request gets accepted</a>.
+
+<!-- The article goes here, in GitHub-flavored Markdown. Feel free to add YouTube videos, images, and CodePen/JSBin embeds  -->
+
+#### More Information:
+<!-- Please add any articles you think might be helpful to read before writing the article -->
+
+

guide/english/javascript/standard-objects/function/function-prototype-apply/index.md

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+---
+title: Function.prototype.apply
+---
+## Function.prototype.apply
+
+This is a stub. <a href='https://github.com/freecodecamp/guides/tree/master/src/pages/javascript/standard-objects/function/function-prototype-apply/index.md' target='_blank' rel='nofollow'>Help our community expand it</a>.
+
+<a href='https://github.com/freecodecamp/guides/blob/master/README.md' target='_blank' rel='nofollow'>This quick style guide will help ensure your pull request gets accepted</a>.
+
+<!-- The article goes here, in GitHub-flavored Markdown. Feel free to add YouTube videos, images, and CodePen/JSBin embeds  -->
+
+#### More Information:
+<!-- Please add any articles you think might be helpful to read before writing the article -->
+
+

guide/english/javascript/standard-objects/function/function-prototype-bind/index.md

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+---
+title: Function.prototype.bind
+---
+## Function.prototype.bind
+
+`bind` is a method on the prototype of all functions in JavaScript. 
+It allows you to create a new function from an existing function, change the new function's `this` context, and provide any arguments you want the new function to be called with. 
+The arguments provided to `bind` will precede any arguments that are passed to the new function when it is called.
+
+
+### Using `bind` to change `this` in a function
+
+The first argument provided to `bind` is the `this` context the function will be bound to. 
+If you do not want to change the value of `this` pass `null` as the first argument.
+
+You are tasked with writing code to update the number of attendees as they arrive at a conference.
+You create a simple webpage that has a button that, when clicked, increments the `numOfAttendees`
+property on the confrence object. You use jQuery to add a click handler to your button, but after clicking the button the confrence object has not changed. Your code might look something like this.
+
+```javascript
+var nodevember = {
+  numOfAttendees: 0,
+  incrementNumOfAttendees: function() {
+    this.numOfAttendees++;
+  }
+  // other properties
+};
+
+$('.add-attendee-btn').on('click', nodevember.incrementNumOfAttendees);
+```
+
+This is a common problem when working with jQuery and JavaScript. When you click the button the `this` keyword in the method you passed to jQuery's `on` method references the button and not the conference object. You can bind the `this` context of your method to solve the problem.
+
+```javascript
+var nodevember = {
+  numOfAttendees: 0,
+  incrementNumOfAttendees: function() {
+    this.numOfAttendees++;
+  }
+  // other properties
+};
+
+$('.add-attendee-btn').on('click', nodevember.incrementNumOfAttendees.bind(nodevember));
+```
+
+Now when the button is clicked `this` references the `nodevember` object.
+
+### Providing arguments to a function with `bind`
+
+Each argument passed to `bind` after the first will precede any arguments passed when the function is called.
+This allows you to pre-apply arguments to a function. In the example below, `combineStrings` takes two strings and concatenates them together. `bind` is then used to create a function that always provides "Cool" as the first string.
+
+```javascript
+function combineStrings(str1, str2) {
+  return str1 + " " + str2
+}
+
+var makeCool = combineStrings.bind(null, "Cool");
+
+makeCool("trick"); // "Cool trick"
+```
+
+The guide on <a href='https://guide.freecodecamp.org/javascript/this-reference' target='_blank' rel='nofollow'>this reference</a> has more information about how what the `this` keyword references can change.
+
+More details on the `bind` method can be found on Mozilla's <a href='https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/bind' target='_blank' rel='nofollow'>MDN docs</a>.
+

guide/english/javascript/standard-objects/function/function-prototype-call/index.md

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+---
+title: Function.prototype.call
+---
+## Function.prototype.call
+
+This is a stub. <a href='https://github.com/freecodecamp/guides/tree/master/src/pages/javascript/standard-objects/function/function-prototype-call/index.md' target='_blank' rel='nofollow'>Help our community expand it</a>.
+
+<a href='https://github.com/freecodecamp/guides/blob/master/README.md' target='_blank' rel='nofollow'>This quick style guide will help ensure your pull request gets accepted</a>.
+
+<!-- The article goes here, in GitHub-flavored Markdown. Feel free to add YouTube videos, images, and CodePen/JSBin embeds  -->
+
+#### More Information:
+<!-- Please add any articles you think might be helpful to read before writing the article -->
+
+

guide/english/javascript/standard-objects/function/function-prototype-isgenerator/index.md

@@ -0,0 +1,15 @@
+---
+title: Function.prototype.isGenerator
+---
+## Function.prototype.isGenerator
+
+This is a stub. <a href='https://github.com/freecodecamp/guides/tree/master/src/pages/javascript/standard-objects/function/function-prototype-isgenerator/index.md' target='_blank' rel='nofollow'>Help our community expand it</a>.
+
+<a href='https://github.com/freecodecamp/guides/blob/master/README.md' target='_blank' rel='nofollow'>This quick style guide will help ensure your pull request gets accepted</a>.
+
+<!-- The article goes here, in GitHub-flavored Markdown. Feel free to add YouTube videos, images, and CodePen/JSBin embeds  -->
+
+#### More Information:
+<!-- Please add any articles you think might be helpful to read before writing the article -->
+
+

guide/english/javascript/standard-objects/function/function-prototype-tosource/index.md

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+---
+title: Function.prototype.toSource
+---
+## Function.prototype.toSource
+
+This is a stub. <a href='https://github.com/freecodecamp/guides/tree/master/src/pages/javascript/standard-objects/function/function-prototype-tosource/index.md' target='_blank' rel='nofollow'>Help our community expand it</a>.
+
+<a href='https://github.com/freecodecamp/guides/blob/master/README.md' target='_blank' rel='nofollow'>This quick style guide will help ensure your pull request gets accepted</a>.
+
+<!-- The article goes here, in GitHub-flavored Markdown. Feel free to add YouTube videos, images, and CodePen/JSBin embeds  -->
+
+#### More Information:
+<!-- Please add any articles you think might be helpful to read before writing the article -->
+
+

guide/english/javascript/standard-objects/function/function-prototype-tostring/index.md

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+---
+title: Function.prototype.toString
+---
+## Function.prototype.toString
+
+This is a stub. <a href='https://github.com/freecodecamp/guides/tree/master/src/pages/javascript/standard-objects/function/function-prototype-tostring/index.md' target='_blank' rel='nofollow'>Help our community expand it</a>.
+
+<a href='https://github.com/freecodecamp/guides/blob/master/README.md' target='_blank' rel='nofollow'>This quick style guide will help ensure your pull request gets accepted</a>.
+
+<!-- The article goes here, in GitHub-flavored Markdown. Feel free to add YouTube videos, images, and CodePen/JSBin embeds  -->
+
+#### More Information:
+<!-- Please add any articles you think might be helpful to read before writing the article -->
+
+

guide/english/javascript/standard-objects/function/index.md

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+---
+title: Function
+---
+## Function
+
+This is a stub. <a href='https://github.com/freecodecamp/guides/tree/master/src/pages/javascript/standard-objects/function/index.md' target='_blank' rel='nofollow'>Help our community expand it</a>.
+
+<a href='https://github.com/freecodecamp/guides/blob/master/README.md' target='_blank' rel='nofollow'>This quick style guide will help ensure your pull request gets accepted</a>.
+
+<!-- The article goes here, in GitHub-flavored Markdown. Feel free to add YouTube videos, images, and CodePen/JSBin embeds  -->
+
+#### More Information:
+<!-- Please add any articles you think might be helpful to read before writing the article -->
+
+