Ablestate cohort1 -JS session 8

Inbuilt JavaScript Functions

/**
 * String Methods: They help us manipilste strings at work with strings.
 *
 * Methoda are the functions that are part of an object or class
 * Properties/Attributes are the variables tha are part of the an object or class
 * Example in JavaScript string objects have the charAt()  method and the lenght property.
 * To access methods and properties with the dot syntax
 * ie.
 * instance.method()
 * instance.property
 */

/**
 * string.charAt([index]): Returnd the character at given index in the string. If the given index is out of bounds, it returns an empty string.
 * To output that the last character the index should be string.length - 1
 */
console.clear();
let elinyaLyeNsi = "Uganda";
let obuwanvu = elinyaLyeNsi.length;

console.log(elinyaLyeNsi.charAt(0));
console.log(elinyaLyeNsi.charAt(obuwanvu - 1));
console.log(elinyaLyeNsi.charAt(obuwanvu + 2));

let enyukuta = elinyaLyeNsi.charAt(obuwanvu + 2);

if (!enyukuta) {
  console.log(
    `Character at position ${obuwanvu + 2}
    is Not found in string ${elinyaLyeNsi}`
  );
}
if (enyukuta === "") {
  console.log("Character is Not found in string");
}

/**
 * stirng.charCodeAt()
 */

console.log(elinyaLyeNsi.charCodeAt(0));
console.log(elinyaLyeNsi.charCodeAt(obuwanvu)); //NaN
console.log(elinyaLyeNsi.charCodeAt(2));
console.log("");
console.log(elinyaLyeNsi.charCodeAt(obuwanvu - 1));

/**
 * string.concat(string2, string3[..., stringN]): Combines two or more strings and returns a new string
 */

// let ebikwataKuNsi = elinyaLyeNsi.conacat("" , "is pearl of Africa");
let ebikwataKuNsi = elinyaLyeNsi.concat(" is pearl of Africa");
console.log(ebikwataKuNsi);

let ekibugaEkikulu = elinyaLyeNsi.concat(); //
console.log(ekibugaEkikulu);

console.log(elinyaLyeNsi);

ekibugaEkikulu = elinyaLyeNsi.concat("kampala is the capital city");
console.log(ekibugaEkikulu);

/**
 * string.indexOf(searchValue[, fromIndex]);
 * It searches the string for a given string passed as the searchValue parameter and returns the position of the first occurance of searched string if it's found. If it's not a  -1 will be returned. You can also specify an optional fromIndex parameter to suggest where the search will start from.
 */

let positionOfW = elinyaLyeNsi.indexOf("W"); // Check whether it will return -1
console.log(positionOfW); //-1 Is return

let positionOfFirsta = elinyaLyeNsi.indexOf("a");
console.log(positionOfFirsta); // Returns the correct position of the first a in Uganda

let positionOfLasta = elinyaLyeNsi.indexOf("a", 3);
console.log(positionOfLasta); // Returns the correct position of the first a in Uganda. which is 5 beacuse we specified the search to last from position 3 of the string.

/**
 * string.LastIndexof()
 */
let positionOfZ = elinyaLyeNsi.lastIndexOf("W"); // Check whether it will return -1
console.log(positionOfZ); //-1 Is return

let positionOfLasta2 = elinyaLyeNsi.lastIndexOf("a");
console.log(positionOfLasta2); // Returns the correct position of the first a in Uganda

let positionOfFirsta2 = elinyaLyeNsi.lastIndexOf("a", 3);
console.log(positionOfFirsta2); /* Returns the correct position of the first a in Uganda. which is 5 beacuse we specified the search to last from position 3 of the string.*/

/**
 * string.localCompare ([searchValue]): Compares two strings and returns 0 and 1 or -1
 * 0 mean the strings fully match
 * 1 means the searchValue is not found or is contained in the string but comes first in sort order
 * - 1 means the searchValue is not found or is contained in the string but comes last in sort order
 */
console.clear();
let stringToSearch = "Uganda, Kampala";
let searchString1 = "Uganda";
let searchString2 = "Kampala";

console.log(stringToSearch.localeCompare("Mbarara")); // It will return 1

console.log(stringToSearch.localeCompare (stringToSearch));   // It will return 0

console.log(stringToSearch.localeCompare(searchString1)); // It will return 1

console.log(stringToSearch.localeCompare(searchString2)); // It will return 1

// Quiz. Using JavaScript implement an algorithm that validates a false values.
// http://www.asciitable.com