I am migrating project from angular1 to angular2. I have one chart where it
shows the moving average line. For this I need to use the circular queue
where it is prototype having add, remove ,getAverage methods.
I have below code developed in angular 1 javascript and need to convert it
to typescript.
Is there any way to import and call javascript functions from typescript or
Is there is way to convert javascript to typescript using any tool
Kindly help.
'
use strict';
angular.module('testeApp.testChart')
.service('testRollingAverageSrc', function(){
this.performRollingAverage = RollingAverage;
function RollingAverage() {
if (!(this instanceof RollingAverage)) {
// multiple conditions need to be checked to properly
emulate Array
if (arguments.length > 1 || typeof arguments[0] !== '
number') {
return RollingAverage.apply(new
RollingAverage(arguments.length), arguments);
} else {
return new RollingAverage(arguments[0]);
}
}
// if no arguments, then nothing needs to be set
if (arguments.length === 0)
throw new Error('Missing Argument: You must pass a
valid buffer length');
// this is the same in either scenario
this.size = this.start = this.end = 0;
this.overflow = null;
this.totalSum =0.0;
// emulate Array based on passed arguments
if (arguments.length > 1 || typeof arguments[0] !== 'number')
{
this.data = new Array(arguments.length);
this.end = (this.length = arguments.length) - 1;
this.push.apply(this, arguments);
} else {
this.data = new Array(arguments[0]);
this.end = (this.length = arguments[0]) - 1;
}
return this;
}
RollingAverage.prototype = {
remove : function () {
var item;
if (this.size === 0) return;
item = this.data[this.end];
// remove the reference to the object so it can be
garbage collected
if( !isNaN(this.data[this.end]) )
this.totalSum -= this.data[this.end];
delete this.data[this.end];
this.end = ((this.end - 1 + this.length) % this.length);
this.size--;
return item;
},
add : function () {
var i = 0;
// check if overflow is set, and if data is about to be
overwritten
if (this.overflow && this.size + arguments.length >
this.length) {
// call overflow function and send data that's
about to be overwritten
for (; i < this.size + arguments.length - this.
length; i++) {
this.overflow(this.data[(this.end + i + 1) %
this.length], this);
}
}
// push items to the end, wrapping and erasing existing
items
// using arguments variable directly to reduce gc
footprint
for (i = 0; i < arguments.length; i++) {
// reduce the totalSum by the removed value
var value = this.data[(this.end + i + 1) % this.
length];
if( !isNaN(value) )
this.totalSum -= value;
// save the new value
this.data[(this.end + i + 1) % this.length] =
arguments[i];
// update totalSum
if( !isNaN((arguments[i])) )
this.totalSum += arguments[i];
}
// recalculate size
if (this.size < this.length) {
if (this.size + i > this.length) this.size = this.
length;
else this.size += i;
}
// recalculate end
this.end = ((this.end + i) % this.length);
// recalculate start
this.start = (this.length + this.end - this.size + 1) %
this.length;
return this.size;
},
avg : function () {
return this.size == 0 ? 0 : this.totalSum / this.size;
}
};
});
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