Difference between revisions of "VJET/Typing Arrays with VJETDocs"

var browsers = ['Firefox', 'Chrome', 'Safari'] ; //< Array 
var browsers = new Array('Firefox', 'Chrome', 'Safari') ; //< Array 
var browsers = new Array() ; //< Array
browsers[0] = 'FireFox' ;
browsers[1] = 'Chrome' ;
browsers[2] = 'Safari' ;

var out = vjo.sysout.println; 
var scores = [91, 77, 84] ; //< Number[]
var names = ['Mark', 'Sean', 'Juan'] ; //< String[] 
for(var i = 0; i < 3; i++) {
    var name = names[i] ; //< String
    var score = scores[i] ; //< Number
    out(name + ": " + score);
}

var keys = [ //< Number[][]
 [1, 2, 3],
 [4, 5, 6],
 [7, 8, 9]
 ];
var total = 0 ; //< Number 
for(var row = 0; row < 3; row++) {
  for (var col = 0; col < 3; col++) {
    total += keys[row][col] ;
    vjo.sysout.println('total: ' + total) ;
  }
}

// This is a VJO o-type.  O-types allow us to define types for Javascript constructs
// such as object literals.
// In this example, arrs.MachineInfo is just a scoping name.
vjo.otype('arrs.MachineInfo') //< public
.defs({
	cpu: {
		vendor: null,	//< public String
		cores: null, 	//< public int
		clock: null 	//< public Number
	}
})
.endType();

//< needs(arrs.MachineInfo)
 
var amd = { 	//< MachineInfo.cpu
    clock: 2.8,
    cores: 4,
    vendor: 'AMD'
};
 
// The order of elements in the Object Literal does not change the type contract.
var intel = { 	//< MachineInfo.cpu
    cores: 8,
    clock: 3.1,
    vendor: 'INTEL'
};
 
// VJET "knows" this is a uniform array of Machine.cpu's so it auto-declares
// for us.  We can see what the declaration would look like since we use it in the
// following function overClock(...)
var cpews = [amd, intel] ;
 
//> void overClock(MachineInfo.cpu[ ] cpus)
function overClock(cpus) {
	for(var i = 0; i < cpus.length; i++) {
		cpus[i].clock += 1.1 ;
	}
}
 
vjo.sysout.println(amd.clock) ; // outputs 2.8
 
// Wind them up!
overClock(cpews) ;
 
vjo.sysout.println(amd.clock) ; // outputs 3.9