CODEWITHSUNDEEP
javascriptarrayslodash
rashadb
rashadb

Reputation: 2543

Filtering two arrays of strings with lodash

I have two arrays of strings like:

var array = ["one", "two", "three", "six", "twelve", "thirteen", "twenty", "forty", "fifty"]

var array1 = ["on", "t"];

I want to filter array to take out any elements that starts with any of the elements in array1. So after filtering array should look like:

["six", "forty", "fifty"];

I also need to filter array by taking out any elements that have within them any of the elements in array1. So after filtering array should look like:

["six"];

Right now I'm using something like:

_.filter(array, function(n){return _.map(array1, function(m){
                    return _.startsWith(n, m)})})

which is returning

[[true, false], [false, true], [false, true], [false, false], 
[false, true], [false, true], [false, true], [false, false], [false, false]];

Upvotes: 0

Views: 1726

Answers (3)

Mikhail Shabrikov
Mikhail Shabrikov

Reputation: 8509

Lo-dash way of solving this problem:

var array1 = ["one", "two", "three", "six", "twelve", "thirteen", "twenty", "forty", "fifty"]

var array2 = ["on", "t"];

var myArray = array1;

_.remove(myArray, function(arr1Elem) {
  return _.some(array2, function(arr2Elem) {
    return _.includes(arr1Elem, arr2Elem);
  });
});

console.log(myArray);

https://jsfiddle.net/a2exvq3r/

Upvotes: 0

rashadb
rashadb

Reputation: 2543

I found an answer right before I saw Jonathan M. Thanks for the post you beat me to it. Here's how I did it with LoDash.

_.filter(array, function(n){if (_.contains(_.map(array1, function(m){
                              return _.startsWith(n, m)}), true)){
                            } else {
                              return n;}}));

Upvotes: 0

Jonathan M
Jonathan M

Reputation: 17461

No lodash needed.

var array1 = ["one", "two", "three", "six", "twelve", "thirteen", "twenty", "forty", "fifty"]

var array2 = ["on", "t"];

array1=array1.filter(function(a){
  return array2.every(function(b){
    return !a.includes(b)
  })
});

http://jsfiddle.net/pbvLn788/

filter(): https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/filter

every(): https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/every

includes(): https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/includes

Upvotes: 2

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