# Data Types

The WXS language currently supports the following data types:

• number
• string
• boolean
• object
• function
• array
• date
• regexp (regular expression)

# number

# Syntax

There are two types of numbers: integers and decimals.

var a = 10;
var PI = 3.141592653589793;

# Properties

• constructor: Returns the string "Number".

# Methods

• toString
• toLocaleString
• valueOf
• toFixed
• toExponential
• toPrecision

For information on using the above methods, refer to the ES5 standard.

# string

# Syntax

There are two ways to write a string:

'hello world';
"hello world";

# Properties

• constructor: Returns the string "String".
• length

For explanations of properties other than constructor, refer to the ES5 standard.

# Methods

• toString
• valueOf
• charAt
• charCodeAt
• concat
• indexOf
• lastIndexOf
• localeCompare
• match
• replace
• search
• slice
• split
• substring
• toLowerCase
• toLocaleLowerCase
• toUpperCase
• toLocaleUpperCase
• trim

For information on using the above methods, refer to the ES5 standard.

# boolean

# Syntax

Boolean values can take one of two values: true or false.

# Properties

• constructor: Returns the string "Boolean".

# Methods

• toString
• valueOf

For information on using the above methods, refer to the ES5 standard.

# object

# Syntax

An object is a type of unordered key-value pair, which can be used in the following ways:

var o = {} // Generates a new empty object.

// Generates a new non-empty object.
o = {
  'string'  : 1,  //The object’s key can be a string.
  const_var : 2,  //The object’s key can also be an identifier that conforms to the variable definition rules.
  func      : {}, //The object’s value can be of any type.
};

//Object property read operation
console.log(1 === o['string']);
console.log(2 === o.const_var);

//Object property write operation
o['string']++;
o['string'] += 10;
o.const_var++;
o.const_var += 10;

//Object property read operation
console.log(12 === o['string']);
console.log(13 === o.const_var);

# Properties

• constructor: Returns the string "Object".

console.log("Object" === {k:"1",v:"2"}.constructor)

# Methods

• toString: Returns the string "[object Object]".

# function

# Syntax

function supports the following definition methods:

//Method 1
function a (x) {
  return x;
}

//Method 2
var b = function (x) {
  return x;
}

function also supports the following syntax (anonymous functions, closures, etc.):

var a = function (x) {
  return function () { return x;}
}

var b = a(100);
console.log( 100 === b() );

# arguments

In function, you can use the arguments keyword. This keyword only has the following properties at present:

• length: The number of arguments passed to the function.
• [index]: Each argument passed to the function can be traversed by the index subscript.

Sample code:

var a = function(){
  console.log(3 === arguments.length);
  console.log(100 === arguments[0]);
  console.log(200 === arguments[1]);
  console.log(300 === arguments[2]);
};
a(100,200,300);

# Properties

• constructor: Returns the string "Function".
• length: Returns the number of formal parameters of the function.

# Methods

• toString: Returns the string "[function Function]".

Sample code:

var func = function (a,b,c) { }

console.log("Function" === func.constructor);
console.log(3 === func.length);
console.log("[function Function]" === func.toString());

# array

# Syntax

array supports the following definition methods:

var a = [];      // Generates a new empty array.

a = [1,"2",{},function(){}];  // Generates a new non-empty array, with array elements of any type.

# Properties

• constructor: Returns the string "Array".
• length

For explanations of properties other than constructor, refer to the ES5 standard.

# Methods

• toString
• concat
• join
• pop
• push
• reverse
• shift
• slice
• sort
• splice
• unshift
• indexOf
• lastIndexOf
• every
• some
• forEach
• map
• filter
• reduce
• reduceRight

For information on using the above methods, refer to the ES5 standard.

# date

# Syntax

Generates the getDate function required by the date object and returns a current time object.

getDate()
getDate(milliseconds)
getDate(datestring)
getDate(year, month[, date[, hours[, minutes[, seconds[, milliseconds]]]]])

• Parameters
  • milliseconds: The number of milliseconds from 00:00:00 UTC January 1, 1970.
  • datestring: The date string, in the format: "month day, year hours:minutes:seconds".

Sample code:

var date = getDate(); //Returns the current time object.

date = getDate(1500000000000);
// Fri Jul 14 2017 10:40:00 GMT+0800 (China Standard Time)
date = getDate('2017-7-14');
// Fri Jul 14 2017 00:00:00 GMT+0800 (China Standard Time)
date = getDate(2017, 6, 14, 10, 40, 0, 0);
// Fri Jul 14 2017 10:40:00 GMT+0800 (China Standard Time)

# Properties

• constructor: Returns the string "Date".

# Methods

• toString
• toDateString
• toTimeString
• toLocaleString
• toLocaleDateString
• toLocaleTimeString
• valueOf
• getTime
• getFullYear
• getUTCFullYear
• getMonth
• getUTCMonth
• getDate
• getUTCDate
• getDay
• getUTCDay
• getHours
• getUTCHours
• getMinutes
• getUTCMinutes
• getSeconds
• getUTCSeconds
• getMilliseconds
• getUTCMilliseconds
• getTimezoneOffset
• setTime
• setMilliseconds
• setUTCMilliseconds
• setSeconds
• setUTCSeconds
• setMinutes
• setUTCMinutes
• setHours
• setUTCHours
• setDate
• setUTCDate
• setMonth
• setUTCMonth
• setFullYear
• setUTCFullYear
• toUTCString
• toISOString
• toJSON

For information on using the above methods, refer to the ES5 standard.

# regexp

# Syntax

Generates the getRegExp function to be used by the regexp object.

getRegExp(pattern[, flags])

• Parameters:
  • pattern: The content of the regular expression.
  • flags: The modifiers. This field can only include the following characters:
    • g: global
    • i: ignoreCase
    • m: multiline

Sample code:

var a = getRegExp("x", "img");
console.log("x" === a.source);
console.log(true === a.global);
console.log(true === a.ignoreCase);
console.log(true === a.multiline);

# Properties

• constructor: Returns the string "RegExp".
• source
• global
• ignoreCase
• multiline
• lastIndex

For explanations of properties other than constructor, refer to the ES5 standard.

# Methods

• exec
• test
• toString

For information on using the above methods, refer to the ES5 standard.

# Data Type Determination

###constructor Property

You can use the constructor property to determine the data type.

Sample code:

var number = 10;
console.log( "Number" === number.constructor );

var string = "str";
console.log( "String" === string.constructor );

var boolean = true;
console.log( "Boolean" === boolean.constructor );

var object = {};
console.log( "Object" === object.constructor );

var func = function(){};
console.log( "Function" === func.constructor );

var array = [];
console.log( "Array" === array.constructor );

var date = getDate();
console.log( "Date" === date.constructor );

var regexp = getRegExp();
console.log( "RegExp" === regexp.constructor );

# typeof

You can also use typeof to distinguish certain data types.

Sample code:

var number = 10;
var boolean = true;
var object = {};
var func = function(){};
var array = [];
var date = getDate();
var regexp = getRegExp();

console.log( 'number' === typeof number );
console.log( 'boolean' === typeof boolean );
console.log( 'object' === typeof object );
console.log( 'function' === typeof func );
console.log( 'object' === typeof array );
console.log( 'object' === typeof date );
console.log( 'object' === typeof regexp );

console.log( 'undefined' === typeof undefined );
console.log( 'object' === typeof null );