adding items to array

Stackoverflow Question http://stackoverflow.com/questions/36719477/array-push-and-unique-items

by csornmo

JavaScript

this.items = [];

add(1);
add(2);
add(3);
add(1);

document.write("added items to array");
document.write("<br>");
function  add(item) {
		//document.write(this.items.indexOf(item));
    if(this.items.indexOf(item) <= -1) {
      
      this.items.push(item);
      //document.write("Hello World!");
    }
}

document.write("array is : " + this.items);