02 Arrays Part 2 JS

In this lesson I've learned about merging 2, 3 or multiple arrays, spreading arrays into an single array, converting string, objects e.t.c into an array.

Author: aayushyadavz

02_Basics/02_arrays.js

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+// 2. Arrays
+
+// (i) Methods to merge Arrays,
+const marvel_heros = ["Thor", "Hulk", "Loki"]
+const dc_heros = ["Flash", "Superman", "Batman"]
+// marvel_heros.push(dc_heros)
+console.log(marvel_heros); // Output: [ 'Thor', 'Hulk', 'Loki', [ 'Flash', 'Superman', 'Batman' ] ]
+/* Note: In this dc_heros array has been taken as an 4th element in marvel_heros array.
+And this is not a good practice or a good syntax. */
+
+const all_heros = marvel_heros.concat(dc_heros)
+console.log(all_heros); // Output: [ 'Thor', 'Hulk', 'Loki', 'Flash', 'Superman', 'Batman' ]
+// Note: .push pushes on existing array & .concat returns a new array.
+
+const all_new_heros = [...marvel_heros, ...dc_heros]
+console.log(all_new_heros); // Output: [ 'Thor', 'Hulk', 'Loki', 'Flash', 'Superman', 'Batman' ]
+/* Note: This methods is used more, cause we can add multiple values in this ([..., ..., ...]).
+
+----------------------------------------------------------------------------------------------------*/
+
+const another_array = [1, 2, 3, [4, 5], 3, 4, [9, [4, 3]]]
+const another_new_array = another_array.flat(Infinity)
+console.log(another_new_array); // Output: [1, 2, 3, 4, 5, 3, 4, 9, 4, 3]
+/* Note: All the values spreaded into a Array.
+
+----------------------------------------------------------------------------------------------------
+
+(ii) Converting into Array, */
+console.log(Array.isArray("Ayush")); // Output: false | Ayush is not an Array.
+// Converting it into an Array,
+console.log(Array.from("Ayush")); // Output: [ 'A', 'y', 'u', 's', 'h' ] | Converted string into Array.
+// Objects into Array,
+console.log(Array.from({name: "Ayush"})); // Output: [] | Returns an empty array.
+
+const score1 = 100
+const score2 = 200
+const score3 = 300
+console.log(Array.of(score1, score2, score3)); // Output: [ 100, 200, 300 ]