String object

• Compare strings
• Access properties and parts of a string
• Manipulate string objects

Strings can be compared using the normal relational operators: <, <=, >, >=, !=, ==

• length: returns the length of a string
• Note, s1 will be a string primitive: var s1 = "abc";
• Note, s2 will be a string object: var s2 = new String("abc");
• Object vs. primitive matters if you use the eval function

• Array subscript notation can be used to get a character at a specific position in a string: "abcd"[2] evaluates to "c"
• charAt(n): returns the character at position n
• concat(s): returns the concatenation of the current string and s
• includes(s): returns true is s is found within the current string
• endsWith(s): returns true if the current string ends with s
• indexOf(s): returns the position of the first occurrence of s
• lastIndexOf(s): returns the position of the last occurrence of s
• match(s1, s2): returns a string with matches of string s1 replaced by string s2
• match(regex, s2): returns a string with matches of regex replaced by string s2
• padEnd(n [,s]): returns a string padded on the right to get it to length n
• padStart(n [,s]): returns a string padded on the left to get it to length n
• repeat(n): returns a string which is n copies of the current string concatenated
• search(regex): returns position of first match of regex
• slice(begin [, end]): returns portion of string starting at begin and going until just before end
• split(delim): returns an array of tokens based on using delim as a delimiter on the current string, where delim may be a string or a regular expression
• startsWith(s): returns true if the current string starts with s
• substr(start [,len]): returns the substring starting at position start which is len characters long
• substring(ndx1 [,ndx2]): returns the substring starting between positions ndx1 and ndx2 (not including ndx2)
• toLowerCase(): returns the lowercase version of the current string
• toUpperCase(): returns the uppercase version of the current string
• trim(): returns a copy of the current string with whitespace trimmed from the front and back

• Number.EPSILON: the smallest interval between two representable numbers
• Number.MIN_SAFE_INTEGER: the smallest safe integer
• Number.MAX_SAFE_INTEGER: the largest safe integer
• Number.MAX_VALUE: the largest positive number JavaScript can represent
• Number.MIN_VALUE: the smallest positive number JavaScript can represent
• Number.POSITIVE_INFINITY: positive infinity (occurs on overflow)
• Number.NEGATIVE_INFINITY: negative infinity (occurs on overflow)
• Number.NaN: special value representing "not a number"
• Number.NEGATIVE_INFINITY: special value representing negative infinity
• Number.POSITIVE_INFINITY: special value representing positive infinity

• isNaN: determines if a value is NaN
• isFinite: determines if a value is a finite number
• isInteger: determines if a value is an integer
• isSafeInteger: determines if a value is an integer in the safe integer range
• parseFloat: converts text to a float
• parseInt: converts text to an integer, can specify radix
• toExponential: returns a string representation in exponential form
• toFixed: returns a string representation in fixed-point form
• toPrecision: returns a string representation with the specified precision
• toString: returns a string representation, can specify radix
• toValue: returns the primitive value