Functions - Reading Assignment

[nepo]

1. function name (parameters) {
   body}
   “body” means code to be executed
2. Binding “let” is local to the block that they are declared in.
   “var” binding is visible throughout the whole function that they appear in or thoroughout the global scope if they are not in a function.
3. A pure function has no side effects and doesn’t rely on side effects from other code.

[bruno]

1. You can create a function in Javascript with an expression that starts with the keyword function.

2. The difference between var and let in regards to scope is that bindings declared with var are global while bindings declared with let are local.

3. 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.

[BlogChain_Charles]

A function is created with an expression that starts with the keyword function, and a body, which contains statements, and that must always be wrapped in braces.
Also, it can be created as an Arrow function, using the ==> signs combined.
2.
“Var” can be viewed in a global binding scope, while “let” as well as, “cons” are binding in the local scopes.
3.
Its a function that is called for their return value, it always returns the same value when called with the same statement… it has no side effects nor rely on the side effects of other codes

[SimonLondon]

How can you create a function in Javascript?
It is created with the keyword function( optional parameters) and it has a body of code which is encompassed with curly brackets {}. If a return value is needed then it is returned with the keyword return and the value to be returned.

What is the difference between var and let in regards to scope?
let only exists in the block that it is created in. This includes for example an if block {}. The var declaration exists within the entire scope of the function block.

What is a pure function?
It is a function which creates no side effects and also does not rely on any side effects from other code or values.

[siQuang]

1. Function can be created with the keyword “function”, or () =>, or “a =>”.
2. The var keyword has a function scope while the let keyword is a local scope and only available within the block.
3. A pure function means it does not depends on outside data or state and does not produce any side effects like console.log.

[Mark1]

1. To create a function we can use a function declaration. The function keyword goes first, then goes the name of the function, then a list of parameters between the parentheses and finally the code of the function, also named “the function body”, between curly braces.
2. var is function scoped and let is block scoped. It can be said that a variable declared with var is defined throughout the program as compared to let.
3. The function always returns the same result if the same arguments are passed in. It does not depend on any state, or data, change during a program’s execution. It must only depend on its input arguments.

[AnCaPepe]

1. How can you create a function in Javascript?: Like a regular binding, where the value is the keyword “function” followed by its parameters between parentheses and its body between brackets

2. What is the difference between var and let in regards to scope?: “let” bindings are only visible inside the block where they are created, while “var” bindings are visible inside the entire function where they are defined

3. What is a pure function?: It’s is a value-producing function that not only
   has no side effects but also doesn’t rely on side effects from other code

[Cemil]

1. const my_function_name = function(x) {
   \ function body
   }
   OR
   function my_function_name(x) {
   \ function body
   }
   OR
   my_function_name = (x) => {
   \ function body
   }

2. The bindings declared with let are only recognized within the scope of the function they were created in. In other words they have a local scope. Whereas the bindings declared by var are recognized within the whole global scope.

3. A pure function is a function which is independent of the side effects of other functions and of the global scope.

[chaneltiana]

1. How can you create a function in Javascript?

• To create a function in Javascript, you would need to use the keyword “function”. Then you could give this function the desired parameters. This will then be followed by the body.

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

• The difference between var and let in regards to scope is that let is used for local variables when they are declared in a specific block. On the other hand, var is used globally

3. What is a pure function?

• A pure function where return values are the same for the same arguments and its evaluation is has no side effects

[castroshanee]

1. Use function (parameter1, parameter 2, …)
2. Let bindings are only visible inside a block. Var, on the other hand, is available globally.
3. No side effect value-producing function

[rostyslavdzhohola]

@ivan

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?

Answer:

1. Const binding = function(value){
   body of the function;
   return result;
   };

function name(value){
body of the function;
return result;
};

const binding = ( value/s) => {
body of the function;
return result;
};

2. “Var bindings” are seen globally by the control of the program. “Let bindings” cannot be seen outside of the block they had been created in. If you call them out side of the block, they return “undefined” type.

3. A pure function is a function that doesn’t have side effects and does not rely on global bindings (side effects of other functions). The primary test of the pure function is that when it is called with the same arguments, it always returns the same values, and doesn’t do anything else.

[CurlyBracketEffect]

1. You can create a function with the function keyword, or anonymously with arrow functions

2. var is global and let is locally scoped

3. A pure function is one that does not cause a side effect.

[markfoster]

1. function FUNCTION NAME (PARAMETERS){
   CODE}

2. Let is limited to the block it is within and var is used globally.

3. Does not have side effects or rely and no other code can affect it.

[Kalimeros]

1. A function is created by an expression starting with the keyword function.
2. Let is local to the block and var is global.
3. A pure function produces the same value if called with the same arguments, and is not affected by global bindings or other side effects that might change.

[jjkkll09]

1. You can create a function in Javascript by:
   const Example = function() {
   statement
   }

2. The difference between var and let is let is local in the block it is created in, while var can be seen within the whole function.

3. A pure function is a function that has no side effects and doesn’t rely on parts of the program that do have side effects.

[Toby_K]

@ivan

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

1. A function is created by making a binding using the keyword function, the name of the function, and optionally parameters to be inserted from outside into the function body (which is always wrapped in braces). The parameters in a function behave like regular bindings, but their initial values are defined the moment the function is called.
2. Bindings created with let are local to the block that they are declared in, while bindings created with var will be recognized throughout the entire program.
3. A pure function is a specific kind of value-producing function that not only has no side effect but also doesn’t rely on side effects from other code. It will always produce the same values if called with the same parameters.

[Jirure]

1. function nameFunction () {instructions}

2. let is local to the block it is created in, var is global.

3. “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—for example, it doesn’t read global bindings whose value might change.”

[ajcapo90]

Answers

1. We can use the keyword function, following by a name to call it. We can have parameters and a body, which contains the statements that are to be executed when the function is called.

2. Bindings declared with the keyword let is local to the block that declared in. In pre-2015 JS, bindings created with var are visible throughout the whole function, or in the global scope, if they are not in a function.

3. A pure function is a value-producing function, it doesn’t produce any side effects, neither rely on other part of the code.

[Spartak]

1. With the function keyword, followed by a name and parentheses.
2. Let declares a variable limited to a block, statement or a expression on wich it is used. Var defines a variable globally, or locally to an entire function regardless of the block
   3.A pure function is a function that given the same input will always return the same output and it produces no side effects.

[Dejan]

1. How can you create a function in Javascript?

• A function is created with an expression that starts with the keyword function.
  Functions have a set of parameters (in this case, only x) 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?

• let is local to the block that they are declared in, so if you create one of those inside of a loop, the code before and after the loop cannot “see” it. Var can be seen globally.

3. What is a pure function?

• A pure function gives an output that is the same as the input, without side effects.