javascript - Use .map to turn quantity into percentages -

i'd use javascript's lodash turn object of arrays percentages. here object:

gender = {    female: [14, 33, 28, 49],   male: [33, 50, 42, 61] } 

i above object

genderpercent = {    female: [0.2978, 0.3975, ..., ...],   male: [0.7021, 0.6024, ..., ...] } 

here tried:

_.map(gender, function (val, index, list) {   gender["male"][gender["male"].length-1] / gender["male"][gender["male"].length-1] + gender["female"][gender["female"].length-1]) }); 

but doesn't seem work.

any suggestions? :)

(note: need solution scale time because gender array(s) continue grow each month.)

you can use loop if male , female lengths same:

var gender = {     female: [14, 33, 28, 49],    male: [33, 50, 42, 61]  }  var m = gender.male;  var f = gender.female;    var genderp = {female:[], male:[]};  (var = 0; < gender.female.length; i++) {    var t = m[i] + f[i];    genderp.male.push(m[i]/t);    genderp.female.push(f[i]/t);  }    console.log(json.stringify(genderp, null, 2));  /*  {    "female": [      0.2978723404255319,      0.39759036144578314,      0.4,      0.44545454545454544    ],    "male": [      0.7021276595744681,      0.6024096385542169,      0.6,      0.5545454545454546    ]  }  */

_.zip , _.unzip can used:

var gender = {     female: [14, 33, 28, 49],    male: [33, 50, 42, 61]  }    var genderp = _.zipobject(['male', 'female'], _.chain(_.zip(gender.male, gender.female))    .map(function(pair) {      var t = pair[0] + pair[1]      return [pair[0] / t, pair[1] / t]    })    .unzip()    .value());    console.log(json.stringify(genderp, null, 2));  /*  {    "male": [      0.7021276595744681,      0.6024096385542169,      0.6,      0.5545454545454546    ],    "female": [      0.2978723404255319,      0.39759036144578314,      0.4,      0.44545454545454544    ]  }  */

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