how to add parameter to the function in angular interval - angularjs

Question

I'm writing a function which will iterate through an array with some time interval.
eg:arr=[1,2,3,4,5,6,7]
And I want to show each element with angular interval.
$interval(step,5000,7);
function step(i){
console.log(arr[i]);
}
So it'll output the numbers inside the array in a 5 seconds' interval. How can I pass the parameter into the function? Thanks.

Answer 1

You could also do this way:
var arrOrig =[1,2,3,4,5,6,7],
arr = angular.copy(arrOrig), //if you want it for later
cancelPromise = $interval(step, 5000);
function step() {
console.log(arr.shift()); //take out the item from top of array
if (!arr.length) { //once array runs out
$interval.cancel(cancelPromise); //cancel interval
}
}
var arr = [1, 2, 3, 4, 5, 6, 7];
var $interval = angular.injector(['ng']).get('$interval');
var cancelPromise = $interval(step, 5000);
function step() {
console.log(arr.shift());
if (!arr.length) {
$interval.cancel(cancelPromise);
}
}
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>

Answer 2

arr.forEach(function (number, idx) {
$timeout(function () {
console.log(number);
}, 5000 * (idx + 1));
});
You want to use $timeout rather than $interval because calling $interval will set up an interval each time for each number and it won't stop until it's cleared explicitly.

Answer 3

var i=0;
$interval(function(){
step(i);
i++
},5000);
function step(i){
console.log(arr[i]);
}

Answer 4

This code will display the numbers one at a time, on repeat:
var getNextNumber = (function(){
var i = 0;
var numbers = [1,2,3,4,5,6,7];
return function(){
if(i >= numbers.length){
i = 0;
}
return numbers[i++];
};
})();
$interval(function(){
var number = getNextNumber();
console.log(number);
},5000);
See this working jsfiddle.
If you want to display them only once, use one of the $timeout solutions from one of the other answers. $interval is all about repeating some command for an indefinite amount of time, whereas $timeout is more about performing a command once in the future. See this answer for more.