Add Content of Array

Author: ankitsingh015

02_Basic/01_Array.js

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+//  Array
+
+const myArr = [0,2,3,4,5,6]
+
+console.log(myArr[0]);          // Zeroth based indexing   output => 0
+
+const myHeros= ['ankit','kumar','singh']
+
+const myArr2 = new Array(1,2,3,4,5)         // Another Way of intialise an array
+console.log(myArr2)
+
+console.log(myArr[2])                   // output => 3
+
+
+// Array Methods
+
+myArr.push(6)                   // push element in array after last index of array
+console.log(myArr)              // output => [0, 2, 3, 4,5, 6, 6]
+
+myArr.push(7)
+console.log(myArr)              // output => [0, 2, 3, 4,5, 6, 6, 7]
+
+myArr.pop()                     // pop the last index element of an array
+console.log(myArr)            // output => [0, 2, 3, 4,5, 6, 6]
+
+myArr.unshift(9);              // right shift of  every element of an array and push element at starting of index
+console.log(myArr)             // output => [9,0, 2, 3, 4,5, 6, 6]
+ 
+myArr.shift(9);                 // left shift of  every element of an array and pop element at starting of index
+console.log(myArr)               // output => [0, 2, 3, 4,5, 6, 6]
+
+console.log(myArr.includes(9))     //output => false
+console.log(myArr.indexOf(3))      //output => 2        if not present return -1
+
+const newArr = myArr.join()         //Adds all the elements of an array into a string, separated by the specified separator string
+
+console.log(myArr);               // output => [0, 2, 3, 4,5, 6, 6]  
+console.log(newArr);             // output => 0, 2, 3, 4,5, 6, 6
+
+//slice ,splice
+
+console.log("A",myArr);         // output => A [0, 2, 3, 4,5, 6, 6]
+
+const myn1 = myArr.slice(1,3)   // Returns a copy of a section of an array
+console.log(myn1)               // output => [ 2, 3 ]
+
+console.log("B",myArr);         // output => B [0, 2, 3, 4,5, 6, 6]
+
+const myn2 = myArr.splice(1,3)   // Removes elements from an array and, if necessary, inserts new elements in their place, returning the deleted elements.
+console.log(myn2);              // output => [ 2, 3, 4 ]
+
+console.log("C",myArr);         // output => C [ 0, 5, 6, 6 ]
+
+
+

02_Basic/02_array.js

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+const marvel_heros = ['thor','ironman','spiderman']
+
+const dc_heros = ['superman','flash',"batman"]
+
+// marvel_heros.push(dc_heros)  // push the array as single element here
+
+console.log(marvel_heros);      // output => [ 'thor', 'ironman', 'sipderman', [ 'superman', 'flash', 'batman' ] ]
+// console.log(marvel_heros[3][1]);    // output => flash
+
+const all_heros = marvel_heros.concat(dc_heros)  // Combines two or more arrays. This method returns a new array without modifying any existing arrays.
+console.log(all_heros)              // output => [ 'thor', 'ironman', 'sipderman', 'superman', 'flash', 'batman' ]
+
+//spread operator
+
+const all_new_heros = [...marvel_heros,...dc_heros]         // spread
+console.log(all_new_heros)     // output => [ 'thor', 'ironman', 'sipderman', 'superman', 'flash', 'batman' ]
+
+const another_array = [1,2,3,[4,5,6],7,[6,7,[4,5]]]
+
+const real_another_array = another_array.flat(Infinity)
+console.log(real_another_array)     // output => [1, 2, 3, 4, 5, 6, 7, 6, 7, 4,5]
+
+
+
+console.log(Array.isArray("Ankit"))   // to chech array or not // output => false
+console.log(Array.from("Ankit"))    // used to convert into array // output => [ 'A', 'n', 'k', 'i', 't' ]
+console.log(Array.from({name : "hitesh"}))  // output => []
+
+
+
+let score1 =100
+let score2 = 200
+let score3 = 300
+
+console.log(Array.of(score1,score2,score1)) // output =>[ 100, 200, 100 ]