String Object Methods
Method |
Description |
charAt() |
returns the character at the specified index |
concat() |
joins two or more strings, and returns a copy of the joined strings |
indexOf() |
returns the position of the first found occurence of a specified value in a string |
lastIndexOf() |
returns the position of the last found occurence of a specified value in a string |
replace() |
searches for a match between a substring (or regex) and a string, and replaces the matched substring with a new substring |
search() |
searches for a match between a regex and a string, and returns the position of the match |
slice() |
extracts a part of a string and returns a new string |
split() |
splits a string into an array of substrings |
substr() |
extracts the characters from a string, beginning at a specified start position, and through the specified number of character |
substring() |
extracts the characters from a string, between two specified indices |
toLowerCase() |
converts a string to lowercase letters |
toUpperCase() |
converts a string to uppercase letters |
trim() |
removes whitespace from both ends of a string |
valueOf() |
returns the primitive value of a String object |
toString() |
returns the value of a String object |
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Math Object Methods
Method |
Description |
abs(x) |
returns the absolute value of x |
round(x) |
rounds x to the nearest integer |
ceil(x) |
returns x, upwards to the nearest integer |
floor(x) |
returns x, rounded downwards to the nearest integer |
exp(x) |
returns the value of Ex |
log(x) |
returns the narural logarithm (base E) of x |
max(x, y, z, ...) |
returns the number with the highest value |
min(x, y, z, ...) |
returns the number with the lowest value |
pow(x, y) |
returns the value of x to the power of y (xy) |
sqrt(x) |
returns the square root of x |
random() |
returns a random number between 0 and 1 |
sin(x) |
returns the sine of x (x in radians) |
cos(x) |
returns the cosine of x (x in radians) |
tan(x) |
returns the tangent of an x |
Date Object Methods
Method |
Meaning |
Units |
getFullYear() |
4-digit year |
2000, 2001, ... |
getMonth() |
month no. |
0 - 11 |
getDate() |
dat of month |
0 - 31 |
getHours() |
hour no. |
0 - 23 |
getMinutes() |
minute no. |
0 - 59 |
getSeconds() |
second no. |
0 - 59 |
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Array Object Methods
Method |
Description |
concat() |
joins two or more arrays, and returns a copy of the joined array |
indexOf() |
search the array for an element and returns its position |
join() |
joins all elements of an array into a string |
lastIndexOf() |
search the array for an element, starting at the end, and returns its position |
pop() |
removes the last element of an array, and returns that element |
push() |
adds new elements to the end of an array, and returns the new length |
reverse() |
reverses the order of the elements in an array |
shift() |
removes the first element of an array, and returns that element |
sort() |
sorts the elements of an array |
toString() |
converts an array to a string, and returns the result |
valueOf() |
returns the primitive value of an array |
Number Object Methods
Method |
Description |
toExponential(x) |
converts a number into an exponential notation |
toFixed(x) |
formats a number with x numbers of digits after the decimal point |
toPrecision(x) |
formats a number to x length |
toString() |
converts a Number object to a string |
valueOf() |
returns the primitive value of a Number object |
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