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rest parameters

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Sam Kessler answered on December 21, 2020 Popularity 10/10 Helpfulness 2/10

answer rest parameters

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// Before rest parameters, "arguments" could be converted to a normal array using:

function f(a, b) {

  let normalArray = Array.prototype.slice.call(arguments)
  // -- or --
  let normalArray = [].slice.call(arguments)
  // -- or --
  let normalArray = Array.from(arguments)

  let first = normalArray.shift()  // OK, gives the first argument
  let first = arguments.shift()    // ERROR (arguments is not a normal array)
}

// Now, you can easily gain access to a normal array using a rest parameter

function f(...args) {
  let normalArray = args
  let first = normalArray.shift() // OK, gives the first argument
}

Popularity 10/10 Helpfulness 2/10 Language javascript

Source: developer.mozilla.org

Tags: javascript rest-parameters

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Contributed on Dec 21 2020

Sam Kessler

0 Answers Avg Quality 2/10

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rest parameters

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const arr = [1, 2, 3];

let [x, ...z] =arr;
console.log(z);
console.log(x);

Popularity 9/10 Helpfulness 2/10 Language javascript

Source: Grepper

Tags: javascript j

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Contributed on Jul 01 2022

Raymund Alum

0 Answers Avg Quality 2/10

Rest parameter

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//******************************************rest parameter
 const double = (...nums) => {//rest parameter is initialized by using three dots
//The numbers in the array called "result" is passed into the rest parameter. 

  console.log(nums);//each number in the rest parameter is ouput to the console
  return nums.map(num => num*2);//each number in the rest parameter is multiplied by 2 and then stored inside a map
};

const result = double(1,3,5,7,2,4,6,8);//creates a constant,called  "result". It then holds an array of numbers, in this example, and it could be an array of any length. 
//The numbers in parentheses after "double" are passed into the rest parameter also called "double"
console.log(result);//The final result is displayed, with each number having been multiplied by 2





// ************************************spread syntax (arrays)
//The spread syntax is similar to the 'rest parameter', one still uses the three dots to initialize it, but the syntax differs slightly, breaking the array up into its various components
const people = ['shaun', 'ryu', 'chun-li'];
//a good use for the spread array would be when we want to take the elements of one array, and spread them into another array (combine them)
const members = ['mario', 'luigi', ...people];
console.log(members);

//spread syntax (objects)
//again, it is similar to the spread syntax for arrays, but this time it is being applied to objects
const person = { name: 'shaun', age: 30, job: 'net ninja' };
//A NEW OBJECT is created, which copies the OBJECT called 'person' and then ALSO creates and fuses the 'personClone' array into the same object
const personClone = { ...person, location: 'manchester' };
console.log(person, personClone);

Popularity 9/10 Helpfulness 2/10 Language javascript

Source: Grepper

Tags: javascript j

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Contributed on Dec 19 2021

Meandering Meerkat

0 Answers Avg Quality 2/10

rest parameter syntax

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foo(arg1, arg2, ...correct)

Popularity 8/10 Helpfulness 1/10 Language whatever

Source: developer.mozilla.org

Tags: rest syntax

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Contributed on Jun 03 2022

marwa benhssine

0 Answers Avg Quality 2/10

rest parameter

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function f(a, b, ...theArgs) {
  // ...
}

Popularity 7/10 Helpfulness 1/10 Language whatever

Source: github.com

Tags: rest whatever

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Contributed on Sep 18 2022

Maria.A Developer

0 Answers Avg Quality 2/10

rest parameter

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function f(a, b, ...theArgs) {
  // ...
}

Popularity 7/10 Helpfulness 1/10 Language whatever

Source: github.com

Tags: rest whatever w

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Contributed on Sep 18 2022

Maria.A Developer

0 Answers Avg Quality 2/10

rest parameter

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function f(a, b, ...theArgs) {
  // ...
}

Popularity 6/10 Helpfulness 1/10 Language whatever

Source: github.com

Tags: rest whatever

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Contributed on Sep 18 2022

Maria.A Developer

0 Answers Avg Quality 2/10

rest parameter

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function f(a, b, ...theArgs) {
  // ...
}

Popularity 7/10 Helpfulness 1/10 Language whatever

Source: github.com

Tags: rest whatever

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Contributed on Sep 18 2022

Maria.A Developer

0 Answers Avg Quality 2/10

rest parameter

Comment

-3

function f(a, b, ...theArgs) {
  // ...
}

Popularity 7/10 Helpfulness 1/10 Language whatever

Source: github.com

Tags: rest whatever

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Contributed on Sep 18 2022

Maria.A Developer

0 Answers Avg Quality 2/10

rest parameters

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