js-array.md

• Find an element

  let items = [{name: 'sbr', age: 28}, {name: 'sumaiya', age: 22}, {name: 'raiyan', age: 1.5}];
  // Returns the value of the first element in the array where predicate is true,
  // and undefined otherwise
  items.find((item) => item.name === 'raiyan');
  // returns {name: 'raiyan', age: 1.5}  

• Find an element index

  let items = [{name: 'sbr', age: 28}, {name: 'sumaiya', age: 22}, {name: 'raiyan', age: 1.5}];
  // Returns the value of the first element in the array where predicate is true
  // and -1 otherwise
  items.findIndex((item) => item.name === 'sumaiya');
  // returns 1  

• Filter elements

    let items = [{name: 'sbr', age: 28}, {name: 'sumaiya', age: 22}, {name: 'raiyan', age: 1.5}];
    // Returns the elements of an array that meet the condition specified in a callback function, 
    // and empty array otherwise
    items.filter((item) => item.name.startsWith('s'));
    // returns [{name: 'sbr', age: 28}, {name: 'sumaiya', age: 22}]