Lodash: Transform single value with array of functions

Question

I'm looking for lodash function that able to transform/map/filter a single value with array of functions, for example:

given value to be: " a, b ,c"

and then call lodash with function like: _.transform(value, functionList)

which functionList is array of functions to split and trimEach.

expected result is ['a', 'b', 'c'].

UPDATE:

Thanks for @vlaz, _.flow() is that what I'm looking for.

The example I gave above is illustrated the purpose of function. I'm not looking for how to split and trim string (sorry, may be my english is not good enough).

To answer my own questions (and my example), the example code is:

function split(v) {
    return v.split(',')
}
function trimStrArray(v) {
    return _.map(v, _.trim)
}
var fn = _.flow([split, trimStrArray])

console.log(fn(" a, b ,c"))

<script src="https://cdn.jsdelivr.net/lodash/4.15.0/lodash.min.js"></script>

Thanks to everyone.

You can compose functions using _.flow, is that what you are looking for? — VLAZ
– VLAZ, Commented Sep 19, 2016 at 10:24

Ori Drori · Accepted Answer · 2016-09-19 10:59:44Z

1

You can achieve it using Array.prototype.reduce() or _.reduce(). The reduce is invoked on the array of functions:

function transform(value, functionList) {
  return functionList.reduce(function(result, fn) {
    return fn(result);
  }, value);
}

var value = " a, b, c";

function split(value) {
  return value.split(',');
}

function trimEach(value) {
  return value.map(function(item) {
    return item.trim();
  });
}

var functionList = [split, trimEach];

var result = transform(value, functionList);

console.log(result);

edited Sep 19, 2016 at 10:59

answered Sep 19, 2016 at 10:37

Ori Drori

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Comments

Nina Scholz · Accepted Answer · 2016-09-19 10:45:43Z

0

You could use _.split, _.map and as callback _.trim;

var string = " a, b ,c",
    result = _.map(_.split(string, ','), _.trim);
console.log(result);

<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.15.0/lodash.min.js"></script>

answered Sep 19, 2016 at 10:45

Nina Scholz

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