What is the procedure for manipulating a string within an array of objects with a string key-value pair using underscore.js?

I am seeking a solution utilizing underscores, but I am open to a vanilla JS alternative if it proves to be the most effective option.

My goal is to utilize array 2 to modify strings in the objects of array1 that either start with or end with the strings found in array2. The desired result can be seen in the modified array3 below:

array1 = [{key1: "Patty Bakery", key2: stuff}, {key1: "Bob Wine Shack",
key2: mattersNot}, {key1: "Romeo Clothing", key2: things}, {key1:
"StackIt", key2: finished}];

array2 = ["Patty", "Romeo", "Wine Shack"];

array3 = [{key1: "Bakery", key2: stuff}, {key1: "Bob",
key2: mattersNot}, {key1: "Clothing", key2: things}, {key1:
"StackIt", key2: finished}];

Currently, the best I have achieved is removing the entire object from array1 using this code snippet:

array1.filter(function(a){
return!_.some(array2, function(b){
return startsWith(a.key1, b)})})
//I have installed and am using underscore.string

This results in an array3 that resembles:

array3 = [{key1:"StackIt", key2: finished}];
javascriptarraysstringunderscore.js

Answer №1

To identify patterns that start or end with certain characters, you can utilize the power of regular expressions (Regex).

Here's a code snippet demonstrating this concept:

var array1 = [{
  key1: "Patty Bakery",
  key2: "stuff"
}, {
  key1: "Bob Wine Shack",
  key2: "mattersNot"
}, {
  key1: "Romeo Clothing",
  key2: "things"
}, {
  key1: "StackIt",
  key2: "finished"
}];

var array2 = ["Patty", "Romeo", "Wine Shack"];
var array3 = [];
array2.forEach(function(item) {
  
  var startWithReg = new RegExp("^" + item);
  var endsWithReg = new RegExp(item + "$");
  
  console.log(startWithReg)
  
  array3 = array1.map(function(row) {
    
    row.key1 = row.key1.replace(startWithReg, '').trim();
    row.key1 = row.key1.replace(endsWithReg, '').trim();
    return row;
    
  });
})

console.log(array3)

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