Modifying key string in array object

Question

I have the following array of object :

[{url:"http://www.url1",value: "number1"},{url:"http://www.url2",value: "number2"},{url: "http://www.url3", value: "number3"},etc...]

I would like to replace all the http://www. with an empty string.

looking at some answers, I've found this :

var resultArr = arr.map(function(x){return x.replace(/http://www./g, '');});

However it doesn't apply in my case since map is only working for array.

so I've also look at this :

array = [{url:1,value: 2},{url:3,value: 4},{url: 5, value: 6}]

Object.keys(array).map(function(url, value) {
   array[value] *= 2;
});

but return me this : [undefined, undefined, undefined]. Moreover for this last solution I don't really know where I should use .replace(/,/g, '') method...

any idea ?

Be aware that you need to escape the special characters in your regex. You could however do .split('.').pop() to get url1, url2 and so forth. — Xotic750
– Xotic750, Commented Sep 23, 2016 at 23:36

Potter · Accepted Answer · 2016-09-23 23:39:06Z

2

es5:

array.map(function(element) {
  return {
    value: element.value,
    url: element.url.replace('http://www.', '')
  }
})

es6+:

array.map(element => ({
   ...element,
   url: element.url.replace('http://www.', '')
}))

answered Sep 23, 2016 at 23:39

Potter

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Comments

trincot · Accepted Answer · 2016-09-23 23:32:14Z

2

You need to get the syntax right. map is OK, or in this case forEach as you mutate:

var array = [{url:'http://www.example.com?xyz',value: 2},
             {url:'http://www.example.com?ok',value: 4},
             {url:'http://www.example.com?hello', value: 6}]

array.forEach(function(obj) {
   obj.value *= 2;
   obj.url = obj.url.replace(/http:\/\/www\./g, '');
});

console.log(array);

answered Sep 23, 2016 at 23:32

trincot

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Comments

Calum · Accepted Answer · 2016-09-23 23:33:43Z

1

You could just iterate over the array like this:

array.forEach(function(entry) {
    entry.url = entry.url.replace('http://www.','');
});

answered Sep 23, 2016 at 23:33

Calum

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Comments

njzk2 · Accepted Answer · 2016-09-23 23:35:18Z

1

You're almost there! map is not really the way to go, since you want to modify the items of the list. forEach makes more sense

var lst = [{
  url: "http://www.url1",
  value: "number1"
}, {
  url: "http://www.url2",
  value: "number2"
}, {
  url: "http://www.url3",
  value: "number3"
}];

lst.forEach(obj => 
            Object.keys(obj)
                 .forEach(key => 
                          obj[key] = obj[key].replace(/http:\/\/www\./g, '')));

console.log(lst);

answered Sep 23, 2016 at 23:35

njzk2

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Comments

BrTkCa · Accepted Answer · 2016-09-23 23:39:25Z

1

var array = [{url:"http://www.url1",value: "number1"},{url:"http://www.url2",value: "number2"},{url: "http://www.url3", value: "number3"}];
for (var i=0 ; i < array.length ; i++){
    array[i].url = array[i].url.replace("http://www.", "");
};
console.log(array);

answered Sep 23, 2016 at 23:39

BrTkCa

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