Please enable JavaScript.

Coggle requires JavaScript to display documents.

Array - Coggle Diagram

- - - - alert( fruits.at(-1) ); // Plum
      - // same as fruits[fruits.length-1]
  - - - returns it
      - last element
      - modifies the array by removing it
    - - to the end of the array
  - - - The for..in loop is optimized for generic objects, not arrays, and thus is 10-100 times slower.
- - - - modifies arr
      - Returns the array of removed elements.
    - - not including end
      - without arguments: arr.slice() creates a copy of arr
    - - accepts any number, arrays, or values
      - Symbol.isConcatSpreadable: can assign value of array like object for array
      - copy itself if not put any argument
  - - - arr.indexOf(item, from)
        
        starting from index from
        
        not work with NaN is element
      - Return index or -1(not found)
      - arr.includes(item, from)
        
        starting from index from
        
        returns true if found
        
        usualy using for check if item exists in the array
      - arr.lastIndexOf
        
        the same as indexOf, but looks for from right to left
    - - find
        
        find an array with the specific condition?
        
        return item or undefined
      - findIndex
        
        has the same syntax like find
        
        return index or -1
      - findLastIndex
        
        Like findIndex but searches from right to left
    - - returns an array of all matching elements (satisfaction condition)
  - - - calls the function for each element of the array and returns the array of results.
      - does not change the original array
    - - The items are sorted as strings by default
      - To use our own sorting order, we need to supply a function as the argumentof arr.sort().
    - - reverses the order of elements in arr
    - - split
        
        splits the string into an array
        
        has an optional second numeric argument
        
        limit on the array length
        
        .split(', ', 2)
        
        str.split(delim)
      - join
        
        arr.join(glue)
        
        creates a string of arr items joined by glue
    - - The function is applied to all array elements one after another and “carries on” its result to the next call.
      - if there’s no initial, then reduce
        takes the first element of the array as the initial value and starts the iteration from the 2nd element.
      - if don't have initial value and array is empty then reduce call without initial value gives an error.
      - arr.reduceRight does the same, but goes from right to left.
    - - check the array
      - If any/all results are true, returns true, otherwise false.
      - some ||, any &&
    - - fills the array with repeating value from index start to end.
    - - copies its elements from position start till position end into itself, at position target (overwrites existing).
      - arr.length not change, if it overflowing it'll ignore
    - - create a new flat array from a multidimensional array.