Swap two strings without using third variable.
Given two strings S1, S2 swap it without using temp variable.
substring(start, end) - The substring() method extracts the characters from a string, between two specified indices, and returns the new sub string.
#Note - The substring() method does not change the original string.
#Implementation
let a = "Hello";
let b = "World";
a = a + b; // "HelloWorld"
b = a.substring(0, a.length - b.length); // substring(0, 5) -> Hello
a = a.substring(b.length); // substring(5) -> World
console.log(a, b)
//output- World Hello
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