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javascriptjqueryarrays
Michael Doye
Michael Doye

Reputation: 8171

Extract value from array when condition is met

I have a simple array:

var c = [4,5,6,7,8,9,10,11,12];

I am iterating through the array to try and return the value which meets the condition:

$.each(c, function() {
    // I need to pass each value from the array as the
    // last argument in the function below
    var p = get_shutter_price( width, height, c );
    if ( p > 0 ) {
        // Return the value from the array which allowed the condition to be met
        console.log( c );
    }
});

This does not work as expected because the entire array is being passed into the function.

How do I return the value form the array which allowed the condition to be met?

For example, if the number 8 from the array is the one that returns a price greater than 0, then return 8.

Upvotes: 0

Views: 1719

Answers (5)

Yoshi
Yoshi

Reputation: 54649

Provided you want all values from c that meet the conditions, simply filter

var c = [4,5,6,7,8,9,10,11,12];

var conditionsMet = c.filter(function (value) {
  return 0 < get_shutter_price(width, height, value);
});

with conditionsMet[0] then being the first to meet the conditions.

Upvotes: 2

nikoloza
nikoloza

Reputation: 966

As I understand correctly you need array.prototype.filter method to filter your array depend on condition.

var b = c.filter(function(val) {
  return val > 0;
});

in your case just put your condition like this:

var b = c.filter(function(val) {
  return get_shutter_price( width, height, val ) > 0;
});

It will return you a new array with this condition.

Upvotes: 1

Jameel Mohammed
Jameel Mohammed

Reputation: 2364

jQuery.each(c, function(index, item) {
// do something with `item` 
});

In your code you missed to pass index and item as arguments to function (here index is optional)

Upvotes: 0

Rohit Kumar
Rohit Kumar

Reputation: 2031

use this instead of c, to pass the current iterating value, and you are 100% right that the whole array is passed when you use c, so use this to pass the current item which is being iterated -

$.each(c, function() {
    // I need to pass each value from the array as the
    // last argument in the function below
    var p = get_shutter_price( width, height, this );
    if ( p > 0 ) {
        // Return the value from the array which allowed the condition to be met
        console.log( this );
    }
});

Upvotes: 0

tcigrand
tcigrand

Reputation: 2397

According to the docs there are two parameters you can use in the callback function, the first is the index of the item you are iterating over, the second is the value of the item.

$.each(c, function(index, val) {
    // I need to pass each value from the array as the
    // last argument in the function below
    var p = get_shutter_price( width, height, val );
    if ( p > 0 ) {
        // Return the value from the array which allowed the condition to be met
        console.log( c=val );
    }
});

Upvotes: 0

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