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javascript recursion

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Famous Fox answered on June 8, 2022 Popularity 9/10 Helpfulness 3/10

answer javascript recursion

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// Lets create a basic recursion
// num parameter set to 1 as default
function recursion(num = 1) {
  // when num is greater than 10 return (break)
  if (num > 10) return
  console.log(num)
  // if num is not greater than 10 call the function again but add 1 to num
  recursion(num + 1)
}

// logs 1 to 10
recursion()

// now lets take this to another level
// lets create a Fibonacci Sequence
function fib(num, arr = [0, 1]) {
  // if num is less than 2 return array
  if (num < 2) return arr;
  // else
  // take the second to last and last item of array with 'destructuring'
  // we take second to last item with .slice(-2) but getting the item next to it 
  // with destructuring
  // look it up when I saw this first time my mind blown
  const [secondToLast, last] = arr.slice(-2);
  
  // now if num is not less than 2
  // lets return the same function that we are inside of
  // and set to num to a minus of itsef
  // then we will use spread operator "..."
  // this means our array's items are now part of another array
  // in other words we spread the items of arr to another array
  // then lets grab the secondToLast and last variables and put it inside of new array
  // so in second loop it will look like simply this 
  // lets say in the first loop we passed number is 8
  // num will be a minus of itself
  // so we will reach another step to "2" break
  // array will be itself plus the secondToLast + last
  // the second loop will represent
  // fib(7, [0, 1, 2]) - because 0 + 1 is 2
  // and third loop will look like this
  // fib(6, [0, 1, 2, 3]) - because 1 + 2 is 3
  // until the num is less than 2
  // and if it's less than two
  // we get our array
  return fib(num - 1, [...arr, secondToLast + last])
}

console.log(
  fib(8) // logs [0,1,1,2,3,5,8,13,21]
)

Popularity 9/10 Helpfulness 3/10 Language javascript

Source: Grepper

Tags: javascript recursion

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Contributed on Oct 02 2023

Famous Fox

0 Answers Avg Quality 2/10

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recursion js

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function sum(n) {
  if (n === 0) return n;
  return n + sum(n - 1);
};

Popularity 10/10 Helpfulness 4/10 Language javascript

Source: www.freecodecamp.org

Tags: javascript j

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Contributed on Oct 27 2023

shahul

0 Answers Avg Quality 2/10

recursive function javascript

Comment

/*
Recursion is when a function calls itself until someone stops it. 
If no one stops it then it'll recurse (call itself) forever.
*/

// program to count down numbers to 1
function countDown(number) {
    // display the number
    console.log(number);
    // decrease the number value
    const newNumber = number - 1;
    // base case
    if (newNumber > 0) {
        countDown(newNumber);
    }
}

countDown(4);
// Out put: 
4
3
2
1

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Source: Grepper

Tags: function functio

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Contributed on Jun 16 2022

Rasel Ahmed

0 Answers Avg Quality 2/10

JavaScript Recursion

Comment

function plus(n) {
  if (n === 0) {
    return 1; // Base case: return 1 when n is 0
  } else {
    return plus(n - 1) + 1; // Recursively call plus with n-1 and add 1
  }
}

console.log(plus(4)); // Output: 5

Popularity 9/10 Helpfulness 3/10 Language javascript

Source: chat.openai.com

Tags: javascript j

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Contributed on Feb 21 2024

Creepy Capuchin

0 Answers Avg Quality 2/10

Recursion In DOM

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function walkTree(node) {
  if (node == null) //
    return;
  // do something with node
  for (var i = 0; i < node.childNodes.length; i++) {
    walkTree(node.childNodes[i]);
  }
}

Popularity 10/10 Helpfulness 2/10 Language javascript

Source: developer.mozilla.org

Tags: dom

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Contributed on Jun 08 2022

Kon Ajang

0 Answers Avg Quality 2/10

javascript recursion

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