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JavaScript Data Structures

bookAdvanced Array Methods and Transformations Sum-Up

map() Method

  • Purpose: Iterates over each element of the original array and applies a specified callback function to produce a new array;
  • Syntax: 
    array.map((element, index, array) => {
  // Callback body
});
  • Key Points:
    • Does not modify the original array;
    • Returns a new array of the same length;
    • Useful for transforming each element of an array.

filter() Method

  • Purpose: Selects elements that meet a particular condition, creating a new array;
  • Syntax: 
    array.filter((element, index, array) => {
  // Callback body
});
  • Key Points:
    • Does not alter the original array;
    • Returns a new array containing elements that satisfy the callback condition;
    • Provides a way to filter elements based on specific criteria.

find() Method

  • Purpose: Discovers and retrieves the first matching element in an array;
  • Syntax: 
    array.find((element, index, array) => {
  // Callback body
});
  • Key Points:
    • Does not alter the original array;
    • Halts upon locating the initial match, returning that specific element;
    • Returns undefined if no matching element is found.

sort() Method

  • Purpose: Modifies the original array, arranging its elements in a new order;
  • Syntax: 
    array.sort((a, b) => {
  // Callback body
});
  • Key Points:
    • Transforms the original array;
    • By default, arranges elements in ascending order;
    • Custom sorting can be achieved using a compare function.
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bookAdvanced Array Methods and Transformations Sum-Up

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map() Method

  • Purpose: Iterates over each element of the original array and applies a specified callback function to produce a new array;
  • Syntax: 
    array.map((element, index, array) => {
  // Callback body
});
  • Key Points:
    • Does not modify the original array;
    • Returns a new array of the same length;
    • Useful for transforming each element of an array.

filter() Method

  • Purpose: Selects elements that meet a particular condition, creating a new array;
  • Syntax: 
    array.filter((element, index, array) => {
  // Callback body
});
  • Key Points:
    • Does not alter the original array;
    • Returns a new array containing elements that satisfy the callback condition;
    • Provides a way to filter elements based on specific criteria.

find() Method

  • Purpose: Discovers and retrieves the first matching element in an array;
  • Syntax: 
    array.find((element, index, array) => {
  // Callback body
});
  • Key Points:
    • Does not alter the original array;
    • Halts upon locating the initial match, returning that specific element;
    • Returns undefined if no matching element is found.

sort() Method

  • Purpose: Modifies the original array, arranging its elements in a new order;
  • Syntax: 
    array.sort((a, b) => {
  // Callback body
});
  • Key Points:
    • Transforms the original array;
    • By default, arranges elements in ascending order;
    • Custom sorting can be achieved using a compare function.
Var allt tydligt?

Hur kan vi förbättra det?

Tack för dina kommentarer!

Avsnitt 5. Kapitel 9
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