How to access alternate array elements in twig using index?

Question

I would like to access alternate elements in an array using its index.
Something like this :

for(i=0;i<count(myarray);i++)
{
print myarray[i+1];
}

How can I do this with twig ?

Community · Accepted Answer · 2020-06-20 09:12:55Z

3

{% set arrayLength = myarray|length - 1 %}

{% for i in range(0, arrayLength, 2) %}
    {{ myarray[i] }}
{% endfor %}

This should print this elements: myarray[0], myarray[2], myarray[4], and so on ...

Set a variable arrayLength to keep number of array's element. We need to set it one unit behind the "real" count as array is zero-indexed
Loop in range from 0 to arrayLength (count - 1 as explained above) with a 2 step (third argument stands for "increase index of n each step"; in this case "n" is 2)
Print the result

Of course you could also skip arrayLength setter and use directly

{% for i in range(0, myarray|length - 1, 2) %}

CommunityBot

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answered Jan 20, 2016 at 8:37

DonCallisto

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Comments

Community · Accepted Answer · 2017-05-23 12:09:31Z

1

I prefer from far the DonCallisto Answer, but for diversity of answers here is one other...

Context :

myarray:
    - a
    - b
    - c
    - d
    - e
    - f
    - g
    - h

Twig :

{% for key, value in myarray if not key % 2 %}
    {{ value }}
{% endfor %}

Results :

a
c
e
g

TwigFiddle : http://twigfiddle.com/hmzuye

CommunityBot

11 silver badge

answered Jan 20, 2016 at 9:48

BENARD Patrick

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This is also a good one and I love when users try to give an alternative to OP.