filter reduce map other fun

Author: nilajcoder

Programs/arrayfun.js

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+
+
+/*
+
+
+let numbers=new Array(1,2,3,4)
+console.log(numbers)// [ 1, 2, 3, 4 ]
+
+
+
+Push
+-----
+
+// Adds elements to the end of an array.
+let arr=[1,2,3,4]
+arr.push(5,6)
+console.log(arr)// [ 1, 2, 3, 4, 5, 6 ]
+
+
+POP
+____
+
+
+//Removes the last element and returns it.
+
+
+let arr=[1,2,3,4,5,6]
+arr.pop()
+
+console.log(arr)// [ 1, 2, 3, 4, 5 ]
+
+Shift
+______
+
+//Removes the first element and returns it.
+
+
+let arr=[1,2,3,4,5,6]
+arr.shift()
+console.log(arr)// [ 2, 3, 4, 5, 6 ]
+
+
+Unshift()
+----------
+
+//Adds elements to the beginning of an array.
+
+
+let arr=[2,3,5]
+arr.unshift(6)
+console.log(arr)//[ 6, 2, 3, 5 ]
+
+
+*/
+
+
+/*
+
+MAP :- it is a built in js array method it creates a new array calling function
+let arr=[1,2,3,4]
+let newarr=arr.map(num=>num>2)
+console.log(newarr)//based on condition true false
+
+
+
+let arr=[1,2,3,4]
+let newarr=arr.map(num=>num*2)
+console.log(newarr)//[2,4,6,8]
+*/
+
+
+/*
+
+Filter - It Creates a new array based on the codition 
+
+let arr=[1,2,3,4]
+let newarr=arr.filter(num=>num>2)
+console.log(newarr)// [3,4]
+
+
+
+let arr=[1,2,3,4]
+let newarr=arr.filter(num=>num%2==0)
+console.log(newarr)//[2,4]
+*/
+
+
+/*
+
+Reduce -It is a built in array method .It is used to reduced the array in a single value
+
+
+let arr=[1,2,3,4]
+let newarr=arr.reduce((acc,num)=>acc+num)
+console.log(newarr)//10
+
+
+let arr=[1,2,3,4]
+let newarr=arr.reduce((acc,num)=>acc*num)
+console.log(newarr)//24
+*/
+
+
+
+/*
+
+🔍 find() vs filter()
+Feature	            find()	                                                                     filter()
+Purpose	   Finds the first element that matches a condition	             Filters all elements that match a condition
+Returns	   A single element (or undefined)	                                   A new array of all matching elements
+Stops At	 First match	                                                       Checks every item
+Return Type	Value (element)	                                                      Array
+
+
+
+
+const nums = [1, 3, 5, 7];
+const result = nums.find(num => num > 4);
+console.log(result); // Output: 5
+
+*/