CODEWITHSUNDEEP
javascript
Mehedee Rahman Setu
Mehedee Rahman Setu

Reputation: 107

How to get array with number from string

Little bit of different format of array. 

var string = "A,B,C,D";

Output should be:

drp1: {A:-1,B:-2,C:-3,D:-4}

I cannot figure out how to get such format with JavaScipt.

Upvotes: 0

Views: 57

Answers (4)

KooiInc
KooiInc

Reputation: 122986

You could use Array.map (see MDN)

var obj = {};
'A,B,C,D'.split(',').map(function (v, i) {this[a] = -(i+1);}, obj);

Upvotes: 0

p.s.w.g
p.s.w.g

Reputation: 149078

The simple solution would be to use split to convert your string to an array, then use reduce to construct the object in the form you want:

var string = "A,B,C,D"
var drp1 = string.split(',').reduce(function(o,x,i){
    o[x] = -1 - i; 
    return o; 
}, {});

Note that reduce was introduced in ECMAScript 5.1, so it may not work in older browsers. If this is a concern, use the polyfill technique described in the linked documentation, or a simple for-loop as Barmar's answer shows.

Upvotes: 0

user405398
user405398

Reputation: 

var string = "A,B,C,D";
var res = {};
string.split(',').forEach(function(e, i) {
  res[e] = - (i + 1);
});
console.log(res);//prints {A: -1, B: -2, C: -3, D: -4}

Upvotes: 0

Barmar
Barmar

Reputation: 782653

var letters = string.split(',');
var drp1 = {};
for (var i = 0; i < letters.length; i++) {
    drp1[letters[i]] = -1 - i;
}

Upvotes: 2

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