Understanding javascript array methods like filter, map, some, every, reduce

array-tutorial.js

// Understanding array methods:-
// - filter 
// - map 
// - some 
// - every
// - reduce 

let myOrgArray = [1,2,3, 4, 5, 6, 7, 8, 9, 10];

// Discussing array by reference

  // let anotherArray = myOrgArray;
  // anotherArray[0] = 9000;
  // console.log('anotherArray', anotherArray);
  // console.log('myOrgArray', myOrgArray);

// Filter

  // const evenArray = myOrgArray.filter((currentItem, index, self) => {
  //   return currentItem % 2 === 0;
  // });
  // console.log('evenArray', evenArray);

// Map

  // const doubleArray = myOrgArray.map((currentItem, index, self) => {
  //   return currentItem + currentItem;
  // });
  // console.log('myOrgArray', myOrgArray);
  // console.log('doubleArray', doubleArray);

// Understanding OR, AND ops

  // const condition1 = true;
  // const condition2 = true;
  // const condition3 = true;
  // if (condition1 || condition2 || condition3) {
  //   console.log('I am an OR operator');
  // }
  // if (condition1 && condition2 && condition3) {
  //   console.log('I am an AND operator');
  // }


// Some (OR operator)

  // const doesItHave3 = myOrgArray.some((currentItem, index, self) => {
  //   return currentItem === 3;
  // });
  // console.log('doesItHave3 ::', doesItHave3);

// Every (AND operator)

  // myOrgArray.push('abc');
  // console.log('myOrgArray ::', myOrgArray)
  // const isItANumbersArray = myOrgArray.every((currentItem, index, self) => {
  //   return typeof currentItem === 'number';
  // });
  // console.log('isItANumbersArray ::', isItANumbersArray);

// Reduce

  // const myReduce = myOrgArray.reduce((accumulator, currentValue, index, self) => {
  //   accumulator = `${accumulator}, ${currentValue} :: ??`;
  //   return accumulator;
  // }, '');
  // console.log('myReduce', myReduce);

//  --------------------------------------------------

// String literals;

  // const name = 'Adeel';
  // console.log('my name is' + name + ' and I like to write javascript');
  // console.log(`my name is ${name} & I like to write javascript`)