[LRUG] [Help request] Programmatically inserting user data into js chart

[John Cinnamond]

As an aside, `map` returns an enumerator if you don’t give it a block, and enumerators have a `with_index` method. So instead of:

    array.each_with_index.map { |value, idx| … }

You can say:

    array.map.with_index { |value, idx| … }

This only saves you 5 characters, but I think it makes the intent slightly clearer.

On Wed, 08 Jun 2016 at 17:57 Tom Stuart

<
mailto:Tom Stuart <tom at codon.com>
> wrote:

On 8 Jun 2016, at 14:32, Jesse Waites <
mailto:jesse.waites at gmail.com
> wrote:

> def make_jsonish(array)

> array.each_with_index do |num, i|

> puts "{ key: #{i}, value: #{num}},"

> end

> end

This looks pretty close to being right, but you want to return a string by joining all the individual lines, not print them out. For example:

def make_jsonish(array)

array.each_with_index.map { |num, i|

"{ key: #{i}, value: #{num}},"

}.join("\n")

end

Less significantly, it would be better to rely on Ruby to turn the resulting data structure (including enclosing square brackets) into JSON for you, so that you’re not responsible for the conversion yourself:

def make_jsonish(array)

elements = array.each_with_index.map { |num, i|

{ key: i, value: num}

}

JSON.pretty_generate(elements)

end

Cheers,

-Tom

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