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Lesson 4: Strings

Contents

  1. Initialization;
  2. Keywords & Methods

1. Initialization

  • Initialize a string by using double quotes or single quotes
     // Declare variables

     var fullName_1 = "Hello 'World'"; // Double quotes + Single quotes
     var fullName_2 = 'Hello \'World\''; // Single quotes + Backlash

     console.log(fullName_1); // Hello 'World'
     console.log(fullName_2); // Hello 'World'

2. Keywords & Methods

Num. Method Name Keyword Description Note Field
1 length Property Returns the length of a string object
2 constructor Property Returns the function that created the String prototype ƒ String() { [native code] }
3 charAt() Method Returns the character at the specified index Find the character
4 at() Method Returns the character at the specified index Find the character
5 charCodeAt() Method Returns the unicode value or ascii value in decimal form of the character at the specified index Find the unicode value of the character
6 codePointAt() Method Returns the unicode value or ascii value in decimal form of the character at the specified index Find the unicode value of the character
7 fromCharCode() Method Returns character converted unicode values String.fromCharCode(108) Find the unicode value of the character
8 fromCodePoint() Method Returns character converted unicode values String.fromCodePoint(108) Find the unicode value of the character
9 includes() Method Returns true if searchString appears as a substring of the result of converting this object to a String, at one or more positions that are greater than or equal to position; otherwise, returns false Check if the substring is in the searching string
10 endsWith() Method Returns true if the sequence of elements of searchString converted to a String is the same as the corresponding elements of this object (converted to a String) starting at endPosition – length(this). Otherwise returns false Check if the substring is in the searching string
11 startsWith() Method Returns true if the sequence of elements of searchString converted to a String is the same as the corresponding elements of this object (converted to a String) starting at position. Otherwise returns false Check if the substring is in the searching string
12 substring() Method Returns the substring at the specified location within a String object Find the substring
13 substr() Method Same as substring() Find the substring
14 slice() Method Returns the substring at the specified location within a String object Find the substring
15 indexOf() Method Returns the position of the first occurrence of a substring Find the position of the substring
16 lastIndexOf() Method Returns the last occurrence of a substring in the string Find the position of the substring
17 search() Method Return the index of the first substring match in a regular expression search Find the position of the substring
18 split() Method Split a string into substrings using the specified separator and return them as an array Spilt string into array
19 trim() Method Removes the leading and trailing white space and line terminator characters from a string (Both sides)
20 trimStart() Method Removes the leading white space and line terminator characters from a string (Left side)
21 trimEnd() Method Removes the leading white space and line terminator characters from a string (Right side)
22 padStart() Method Pads the current string with a given string (possibly repeated) so that the resulting string reaches a given length. The padding is applied from the start (left) of the current string Append the character to the string
23 padEnd() Method Pads the current string with a given string (possibly repeated) so that the resulting string reaches a given length. The padding is applied from the end (right) of the current string Append the character to the string
24 concat() Method Returns a string that contains the concatenation of two or more strings Append string to string
25 repeat() Method Returns a string value that is made from count copies appended together. If count is 0, the empty string is returned
26 replace() Method Replaces first text or character in a string, using a regular expression or search string Replace first character in a string
27 replaceAll() Method Replaces all text or character in a string, using a regular expression or search string Replace all character in a string
28 match() Method Matches a string with a regular expression, and returns an array containing the results of that search
29 localeCompare() Method Determines whether two strings are equivalent in the current or specified locale One of 3 return values: -1 if the string is sorted before the compareString; 0 if the two strings are equal; 1 if the string is sorted after the compareString
30 toLowerCase() Method Converts all the alphabetic characters in a string to lowercase
31 toUpperCase() Method Converts all the alphabetic characters in a string to uppercase
32 toLocaleLowerCase() Method Converts all alphabetic characters to lowercase, taking into account the host environment's current locale
33 toLocaleUpperCase() Method Converts all alphabetic characters to lowercase, taking into account the host environment's current locale
34 toString() Method Convert to a string type and return it as a string
35 valueOf() Method Returns the primitive value of the specified object