Question 205463 in Javascript Question posted in
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JavaScript : how to reduce a group of arrays using index?

I have a question

I have an array group like this :

myArray = { tab1 : [], tab2 : [], tab3 : [], tab4 : [] }

I want to always keep my first tab (tab1) and to keep an additionnal tab using an index (which value is between 2 and 4)

For example : if my index value is 2, I want to keep the tab2 and obtain this :

myArray = { tab1 : [], tab2 : [] }

Thanks

Tags:

2

Answers


  1. 0

    You can use Array.prototype.reduce to do something like this

    Object.entries(myArray).reduce((acc, [key, value], index) => {
  // Check if it is the first element or the one to keep
  if (!index || index === indexToKeep) {
    acc[key] = value;
  }
  return acc;
}, {});

    Here Object.entries(myArray) will transform your object into an 2d array of key / value

    [
  ['tab1', [/* Value of myArray.tab1 */]], 
  ['tab2', [/* Value of myArray.tab2 */]], 
  // etc...
]
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  2. 0 
        let myArray = { tab1: [], tab2: [], tab3: [], tab4: [] };
    const index = 2; // it could be 3 or 4 ....
    
    // Remove additional tabs based on the index value
    for (let key in myArray) {
      if (key !== 'tab1' && key !== `tab${index}`) {
        delete myArray[key];
      }
    }
    
    console.log(myArray);
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