All the standard built-in objects in LC2 are shown below.
Array
array0[element1,element2,…]; array0[n]=element(n+1)
array1[array0,element1,…]
process main () {
Smartisan = ["T1","T2","M1"];// define an array named "Smartisan"
smartphones = [Smartisan,"iPhone","Mi"];//define an array named "smartphones"
log Smartisan[0];//output T1
log smartphones[0][2];//output M1
}
length
length(array)
array.length
log length(smartphones); //Output 3 log smartphones.length;//Output 3
for…in/of
for(var in array)
for(var of array)
for...in/of in instruction keyword.
for (x in smartphones){
log x; //Output 0,1,2
}
for (x of smartphones){
log x; //Output ["T1","T2","M1"],iPhone,Mi
}
indexOf
indexOf(array,element)
indicates the position of a specified element.
log indexOf(smartphones,"Smartisan"); //Output 0
log smartphones.indexOf("iPhone"); //Does not support this syntax，output -1.
Bool
bool([variable,number,RegExp])
a boolean object wrapper which could convert a variable/number/RegExp to a Boolean format.bool(3.14) // Output true bool(3>4) // Output false bool(3-3) // Output false bool(/[a-z]/) // Output true
Date
Creates a JavaScript Date instance that represents a single moment in time. Date objects are based on a time value that is the number of milliseconds since 1 January, 1970 UTC.
now
now();
returns the number of milliseconds elapsed from January 1st 1970, 00:00:00 UTC to the current time.//Set 2017-1-1,00:00 as current time log now(); //Output 1483200000
format
format(“time”,”display-format”)
format(now(),”display-format”)
//Output formated time.
log format("May 11 2012","fullDate"); //Output：Friday,May 11,2017
log format("May 11 2012","isoDate"); //Output：2012-05-11
//Assuming January 1, 2017, 0:00 to be the current time. Output formated current time.
log format(now(),"yyyy-mm-dd");//Output：2017-01-01
log format(now(),"yyyy-m-d");//Output：2017-1-1
log format(now(),"mm-d");//Output：01-1
log format(now(),"dddd,mmmm dS,yyyy,h:MM:ss TT");//Output：Sunday,January 1st,2017,0:00:00 AM
log format(now(),"isoDateTime");//Output：2017-01-01T00:00+0800
Math
abs
abs([number])
returns the absolute value of a number, that is abs(x)=|x|.
abs(-3.14) // Output 3.14
abs('') // Output 0
abs() // Output null
abs('string') // Output null
ceil
ceil([number])
returns the smallest integer greater than or equal to a given number.ceil(3.14) // Output 4 ceil(-3.14) // Output -3
floor
floor([number])
returns the largest integer less than or equal to a given number.floor(3.14) // Output 3 floor(-3.14) // Output -4
max
max([number1],[number2],…)
returns the maximum of a set of numbers.
max(3+2,number('3'+'2')) // Output 32
min
min([number1],[number2],…)
returns the minimum of a set of numbers.
min(3+2,number('3'+'2')) // 输出 5
random
random()
returns a float pseudo-random number in the range [0, 1), that is, from 0 (inclusive) up to but not including 1 (exclusive), which you can then scale it to your desired range. The implementation selects the initial seed to the random number generation algorithm; it cannot be chosen or reset by the user.//Output a random number in a specified range. random() * (max - min) + min
Number
number(“string”)
number is a wrapper object allowing you to work with numerical values. A Number object is created using the number() constructor.
number('3.14') // Output 3.14
number('3'+'2') // Output 32
number('') // Output 0
String
string([variable,number])
The global object string is a constructor for a string or a sequence of characters. Values could also be converted or generated into strings with it.log length(string(3.14)); //Output 4
length
length(“string”)
represents the length of a string.
length("Lemonce") //Output 7
charAt
charAt(“string”,[letterPosition:number])
returns the specified character from a string.Number counts from zero.
charAt('Lemonce',5) //Output c
indexOf
indexOf(“wholeString”,”chosenLetter”)
returns the index within the calling string object of the first occurrence of the specified value, starting the search at fromIndex. Returns -1 if the value is not found.
indexOf('Lemonce','L') //Output 0
indexOf('Lemonce','e') //Output 1
indexOf('Lemonce','l') //Output -1
substr
substr(“string”,[startLetter:number],[length:number])
returns the characters in a string beginning at the specified location through the specified number of characters.
substr('Lemoncase',2,3) //Output 'mon'
substr('Lemoncase',2) //Output 'moncase'
trim
trim(“string”)
removes whitespace from both ends of a string. Whitespace in this context is all the whitespace characters (space, tab, no-break space, etc.) and all the line terminator characters (LF, CR, etc.).
trim(' Lemon case ') //Output 'Lemon case'