JavaScript ObjectExamples

Examples using built-in JavaScript objects.

String Object

• Return the length of a string
• Add style to a string
• Return the position of the first occurrence of specified text in a string - indexOf() method
• Find a specific character in a string, and if found, return it - match() method
• Replace characters in a string - replace()


• For more string object examples, see ourJavaScript String Object reference manual.

Date Object

• Use the Date() method to return today's date and time
• Use getTime() to calculate how many milliseconds from 1970 to today
• Use setFullYear() to set a specific date
• Use toUTCString() to convert today's date (according to UTC) to a string
• Use getDay() to display the weekday, not just a number
• Display a clock


• For more Date object examples, see ourJavaScript Date Object reference manual.

Array Object

• Create an array
• Join two arrays - concat()
• Join three arrays - concat()
• Form a string from array elements - join()
• Remove the last element of an array - pop()
• Add new elements to the end of an array - push()
• Reverse the order of elements in an array - reverse()
• Remove the first element of an array - shift()
• Select elements from an array - slice()
• Array sorting (ascending alphabetical order) - sort()
• Numeric sorting (ascending numerical order) - sort()
• Numeric sorting (descending numerical order) - sort()
• Add an element at position 2 in an array - splice()
• Convert an array to a string - toString()
• Add new elements to the beginning of an array - unshift()


• For more Array object examples, see ourJavaScript Array Object reference manual.

Boolean Object

• Check logical values


• For more Boolean object examples, see ourJavaScript Boolean Object reference manual.

Math Object

• Use round() to round a number
• Use random() to return a random number between 0 and 1
• Use max() to return the larger of two given numbers
• Use min() to return the smaller of two given numbers
• Celsius to Fahrenheit conversion

General

• Use the for...in statement on object elements


• For more Math object examples, see ourJavaScript Math Object reference manual.