8 Methods to Iterate through Array

iterate-over-array.js

//8 Methods to Iterate through Array

//forEach (Do Operation for Each Item in the Array)
[1,2,3].forEach(function(item,index) {
  console.log('item:',item,'index:',index);
});

//map (Translate/Map all Elements in an Array to Another Set of Values.)
const oneArray = [1,2,3];
const doubledArray = oneArray.map(function(item) {
  return item*2;
});
console.log(doubledArray);

//filter (Remove Unwanted Elements based on a Condition)
const intArray = [1,2,3];
const rootArray = intArray.filter(function(item) {
  return item % 2 === 0 ;
});
console.log(rootArray);

//reduce (Gives Concatenated Value based on Elements across the Array)
const sum = [1,2,3].reduce(function(result,item) {
  return result + item;
}, 0);
console.log(sum);

//some (If Any Item in the Entire Array Matches the Condition, it returns True)
const hasNegativeNum = [1,2,3,-1,5].some(function(item) {
  return item < 0 ;
});
console.log(hasNegativeNum);

//every (If All Items Matches the Condition,it returns True else False)
const allPositiveNum = [1,2,3].every(function(item) {
  return item > 0;
});
console.log(allPositiveNum);

//find (If Item Matches the Condition,it Returns that Item of the Array else Return Undefined)
const objects = [{id: 'a'},{id: 'b'},{id: 'c'}];
const found = objects.find(function(item) {
  return item.id === 'b';
});
console.log(found);

//find index (If Item Matches the Condition,it Returns the Index of that Item)
const objects2 = [{id: 'a'},{id: 'b'},{id: 'c'}];
const foundIndex = objects2.findIndex(function(item) {
  return item.id === 'b';
});
console.log(foundIndex);

Nice, well done! 😃

Very helpful. Thanks.

Thanks @krillo 😇

Thanks @davvvvsss 😇