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Tag: strings

JavaScript / nodejs

[JavaScript] Working with strings

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/* Escape Sequences in Strings
Code    Output                  
\'  single quote
\"  double quote
\\  backslash
\n  newline
\r  carriage return
\t  tab
\b  word boundary
\f  form feed               */
 
var firstStr = 'I come first. '
var secondStr = 'I come second.'
 
/* Concatenating Strings with Plus Operator */
var myStr = firstStr + secondStr;
 
/* Concatenating Strings with the Plus Equals Operator */
var myStr = firstStr;
myStr += secondStr;
 
/* Bracket Notation to Find the First Character */
var firstName = "Carlos";
var firstLetter = firstName[0]; // firstLetter is "C"
var firstName[0] = "K";         // not possible! Individual characters of a string literal cannot be changed.
 
/* Bracket Notation to Find the Last Character in a String */
var firstName = "Carlos";
var lastLetter = firstName[firstName.length - 1]; // lastLetter is "s"
 
/* Split a string into an array of substrings */
var str = "How are you doing today?";
var res = str.split(" ");  // [ 'How', 'are', 'you', 'doing', 'today?' ]
var otherString = "How9are7you2today";
var byDigits = otherString.split(/\d/); // ["How", "are", "you", "today"]
 
/* Array of strings to single string */
var stringArray = [ 'How', 'are', 'you', 'doing', 'today?' ];
var str = stringArray.join(" "); // "How are you doing today?"
 
/* Check if a string ends with "universe." */
var str = "Hello world, welcome to the universe.";
var n = str.endsWith("universe.");
 
/* Lower & Upper Case */
console.log('ALPHABET'.toLowerCase()); // 'alphabet'
console.log('alphabet'.toUpperCase()); // 'ALPHABET'
console.log('test'.charAt(0).toUpperCase() + 'test'.slice(1)); // Test
 
/* reverse String */
let str = "test";
let reverseStr = str.split("").reverse().join(""); // tset