Built-in object methods include common methods of Array objects, common methods of String objects, common methods of Math objects, common methods of Date objects, etc. Detailed introduction: 1. Common methods of Array objects include push(), pop(), shift(), unshift(), concat(), slice(), splice(), etc.; 2. Common methods of String objects include length, charAt(), concat(), concat(), etc.
Operating system for this tutorial: Windows 10 system, Dell G3 computer.
Different built-in objects have different methods. The following are some common examples of built-in objects and their methods:
1. Common methods of Array objects:
push() : Add one or more elements to the end of the array.
pop(): Remove and return the last element of the array.
shift(): Delete and return the first element of the array.
unshift(): Add one or more elements to the beginning of the array.
concat(): Concatenate two or more arrays.
slice(): Returns a part of the array.
splice(): Add or remove elements from an array.
2. Common methods of String objects:
length: Returns the length of the string.
charAt(): Returns the character at the specified index position.
concat(): Concatenate two or more strings.
indexOf(): Returns the first matching position of the specified character or substring.
substring(): Returns a part of the string.
toUpperCase(): Convert the string to uppercase.
toLowerCase(): Convert the string to lowercase.
3. Commonly used methods of Math objects:
abs(): Returns the absolute value of the number.
ceil(): Round up.
floor(): Round down.
round(): Rounding.
max(): Returns the maximum value in a set of numbers.
min(): Returns the minimum value in a set of numbers.
random(): Returns a random number between 0 and 1.
4. Common methods of Date objects:
getDate(): Returns a certain day in the month.
getMonth(): Returns the month (0-11).
getFullYear(): Returns the year.
getHours(): Returns the number of hours (0-23).
getMinutes(): Returns the number of minutes (0-59).
getSeconds(): Returns the number of seconds (0-59).
getTime(): Returns the number of milliseconds since January 1, 1970.
These are just some examples of methods of common built-in objects. Different built-in objects may have more methods. The specific method also needs to be determined according to the programming language and built-in objects used. You can consult relevant documentation or reference books to learn more about built-in object methods.
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