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JavaScript Objects Examples

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Examples of using the built-in JavaScript objects.

String Object

Return the length of a string
Style strings
Return the position of the first occurrence of a text in a string - indexOf()
Search for a text in a string and return the text if found - match()
Replace characters in a string - replace()

More String object examples in our JavaScript reference.

Date Object

Use Date() to return today's date and time
Use getTime() to calculate the years since 1970
Use setFullYear() to set a specific date
Use toUTCString() to convert today's date (according to UTC) to a string
Use getDay() and an array to write a weekday, and not just a number
Display a clock

More Date object examples in our JavaScript reference.

Array Object

Create an array
Use a for...in statement to loop through the elements of an array
Join two arrays - concat()
Join three arrays - concat()
Join all elements of an array into a string - join()
Remove the last element of an array - pop()
Add new elements to the end of an array - push()
Reverse the order of the elements in an array - reverse()
Remove the first element of an array - shift()
Select elements from an array - slice()
Sort an array (alphabetically and ascending) - sort()
Sort numbers (numerically and ascending) - sort()
Sort numbers (numerically and descending) - sort()
Add an element to position 2 in an array - splice()
Convert an array to a string - toString()
Add new elements to the beginning of an array - unshift()

More Array object examples in our JavaScript reference.

Boolean Object

Check Boolean value

More Boolean object examples in our JavaScript reference.

Math Object

Use round() to round a number
Use random() to return a random number between 0 and 1
Use max() to return the number with the highest value of two specified numbers
Use min() to return the number with the lowest value of two specified numbers
Convert Celsius to Fahrenheit

More Math object examples in our JavaScript reference.


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