Functions - Reading Assignment

[margaritavas]

1. Starting with an expression that starts with the keyword function.
2. In regards to scope, let defines a binding that is local and applies to the block where it is used, whereas the var keyword defines a variable with a larger scope.
3. It is a specific kind of value-producing function that not only has no side effects but also does not rely on side effect from other code.

[Marcelle]

1. A function is created with a phrase that starts with the keyword “function”.
2. A Var keyword (old style pre-2015 JavaScript) can be seen throughout the whole function they appear in, but the Let binding can only be seen within the “block” it’s been created in (and not by any code outside that loop.
3. A Pure Function is a function that will always return the same output when given the same input, in other words it produces no side effects.

[spongetti]

How can you create a function in Javascript?

By using the keyword function

What is the difference between var and let in regards to scope?

With let variables can be declared that are limited a block, statement, or expression on which it is used while var defines a global variable

What is a pure function?

A pure function behaves in a predictable way depending on given input parameters.

[inzhagey]

1. How can you create a function in Javascript?
   By creating a function at the front, naming it, and that can or cannot have a parameter.

2. What is the difference between var and let in regards to scope?
   This is different from a variable because it is limited in its uses and has different uses than functions.

3. What is a pure function?
   It is a function that does not affect anything else and always gets the same output if it has the same parameters.

[MartyMonster]

1. How can you create a function in Javascript?

A function is created with an expression that starts with the keyword function. They have a set of parameters and a body which contains the statements that are to be executed when the function is called.

2. What is the difference between var and let in regards to scope?

Variables that begin with let are visible only within their local code block. By comparison, variables that are initialized with var are globally visible either within a function or within the program as a whole.

3. What is a pure function?

A pure function is a specific kind of value-producing function that not only
has no side effects but also doesn’t rely on side effects from other code.

[Phuong]

1 How can you create a function in Javascript?
A function is created with the function key word. It has a expression with the function keyword and a set of parameters and a body which contains the stetements.

2. What is the difference between var and let in regards to scope?
   “let” or “const” are local to the block in which they are declared in. So for example declared in a loop the code before and after can’t see “let” or “const”.

3. What is a pure function?
   A pure function is a value-producing function, which has no side effects and doesn’t get affected from other code. It always produces the same value under same given inputs.

[Crypto_Sherlock]

1. You can create a function by calling the keyword “function” before an expression.

2. let declares a variable that is limited to the block scope the statement or expression it is used in. var defines the variable globally if they are not in a function.

3. A pure function is a specific kind of value-producing function that
   has no side effects and doesn’t rely on side effects from other code.

[Jason_Mack]

• How can you create a function in Javascript?

A function is created with a set of keywords to define the function. Next you have to set the parameters. It is possible for a function to have parameters or no parameters, but functions always need braces where the statement is contained. Functions have a set of parameters and a body which explain how the function is to be called.

• What is the difference between var and let in regards to scope?

Let is local to the block and declared within the block. Let along with const cannot be seen by previous blocks and future. The code before and after the loop cannot see let or const.

Var can be seen by previous and future blocks. The keyword var is visible throughout the whole function or the global binding depending on how var is used.

• What is a pure function?

A pure function does not have any side effects, or need to rely on side effects from previous code. It always produces the same value and does not do anything else.

[FreeSpirit2222]

1. How can you create a function in JavaScript?

To create a function you type the keyword function nameOfFunction ()

2. What is the difference between var and let in regards to scope?

let can be only available inside the “scope” it’s declared, like in for loop, var can be accessed outside the loop

3. What is a pure function?

a pure function’s input always produce the same output and it has no side affects.

[ZED91]

1. How can you create a function in Javascript?

const “name” = function(“parameter or no parameter”){“formula/function”}. Or function “name”(“parameter”){“formula/function”}

2. What is the difference between var and let in regards to scope?

“var” is are global binding. “let” are local binding, only valid or visible in the block like a loop

3. What is a pure function?

Pure function don’t produce side effects nor do they rely on side effects of other functions. So they produce the same result all the time. Whereas nonpure function might need more testing

[syrafa]

1. You can create a function by putting the function keyword at the start of a statement e.g.
   function square = (x){
   return xx:
   }
   or by starting an expression with a function e.g.
   const square = function (x){
   return xx
   };
   console.log(square(12));

2. The difference between var and let in regards to scope is that var bindings are “seen” throughout the entire program and respected as such, where as let or const are bindings that are “seen” in a local block or statement.

3. A pure function is a specific type of value-producing function that not only has no side effects (e.g. does not print a line) but also does not rely on side effects from other code. For example, it does not read global bindings whose value might change. A pure function produces the same value when called with the same arguments.
   Pure functions are different from the console.log function because console.log produces a side effect whereas pure functions only produce a value.

[Reach.Higher]

@ivan

a pure function

1. A function in JavaScript is created with an expression that starts with a keyword, has a set of parameters, and a body.

funtcion name(argument) {statement to be executed}

2. The main difference between the var and let keywords is that var can be used for a global binding which binds outside the fx or block. The let keyword is a local binding that can only be referenced for that specific parameter or declared within a fx.

3. A pure function is a specific kind of value-producing function that doesn’t produce or rely on side effects.

[Bojo]

1. A function can be created in 3 different ways:

1. function holds a value of function - let x = function (y)
2. function is a value - function x(y)
3. with a short way by skipping a keyword “function” - let x(y)=>{}

2. var is a global binding, its visible throughout the blocks and visible for local references inside the blocks, let is a local binding - its visible only inside the block if it was created inside the exect one block, but visible for expressions inside the block if it was declared outside the any block.
3. pure is function that has no side effects and acts with the same way any time it is called.

[Vinsenzo]

1. You can create a function utilizing the keyword function , which can have zero or multiple arguments and a body, which has the statements that will be performed when the function is called. You can also create a function as a value where a var or let is bound to the function. An arrow function (=>) can also be utilized instead of the function keyword.
2. Var is global and can be used throughout the function it is declared in, otherwise it can be used globally. Let is local to the block that it is declared in and can only be used and seen locally within that block.
3. A pure function is a specific kind of value-producing function that doesn’t have any side effects and doesn’t rely on side effects from the other code.

[LilKnownFact]

1. How can you create a function in Javascript?
   There’s a couple different methods to create a function. You can create a finding and call it a function as in: const square = function(){};
   You can use declaration notation as in: function square(){};
   Or you can use the notation that uses arrows: const square = () => {};

2. What is the difference between var and let in regards to scope?
   Let and const are local to their block in terms of scope. Var is visible throughout the whole function, they are global in scope.

3. What is a pure function?
   A pure function produces no side effects, the same input will always equal the same output.

[Narnia]

How can you create a function in Javascript?
First you name the function with a keyword, then write the body (which must always be wrapped in braces).

What is the difference between var and let in regards to scope?
Bindings created with the var keyword are visible throughout the whole whole function, or throughout the global scope if they are not in a function. Bindings declared with the let keyword are local to the block they are declared in, so the code before and after the loop cannot see it.

What is a pure function?
A pure function is a specific function that always produces the same value, has no side effects, and does not rely on side effects from other code. If you run the function and it works correctly in that context then it will work in any context.

[Chris_Goldman]

@ivan

Welcome to the discussion about the reading assignment about Functions - Reading Assignment.

Leave your answers to the questions below in this thread. If you have any questions or you want to discuss something connected to the assignment feel free to do it in this thread as well, but please everything to the topic.

1. How can you create a function in Javascript?
2. What is the difference between var and let in regards to scope?
3. What is a pure function?

1. you can create a function by binding a function as a value, or using a value or string to declare a function.

2. var bindings scope is either global or bound to the nearest function.Let bindings are only visible from inside the environment they are declared, or just outside the function but no farther out of function and not globally.

3. a pure function is defined as one that does not rely on other bindings or functions to perform its task, and also to be pure, the output value of the function must be able to be completely substituted for the function in a program and the program should still have the exact same outcome.

[MARTIS]

1.) Creating a function uses the keyword function as an expression. When used as a statement, it can be used to declare a binding and give it a function as its value.

2.) let variables are used locally within the block it’s created in and var variables are defined with a larger or global scope.

3.) Pure functions produce a value without side effects. Its return value is the same for the same arguments. A mathematical function.

[Dougal]

1. How can you create a function in Javascript?
   By using the word - function - followed by its name, then parentheses which may contain arguments, parameters or statements. Finally ending with a body to be executed which must be surrounded by curly braces.

2. What is the difference between var and let in regards to scope?
   Bindings created with let are local to the block they are created in but var are visible throughout the whole function

3. What is a pure function?
   A function that has no side effects and doesn’t rely on other code with side effects.

[Daniel_Haydn]

1:you create a function like this:

function WorstPartSoFar(x){

insert other functions, conditions or loops here

};

2:“var” sets a global variable while “let” seems to be used within a scope of a function and only is seen within that scope.

3:it’s a value producing function which has no side effects and also doesn’t rely on side effects of other functions.