Question

I’m new to javascript and have a simple task. I have an array “values” and a second array “gender”, and I want to create a third array which is “values” where gender == “Males”. The variables look like this:

var values = new Array();
values[0] = .1
values[1] = .3
values [2] = .7
values[3] = .8
var gender = new Array();
gender[0]='Males'
gender[1]='Males'
gender[2]='Females'
gender[3]='Females'

The equivalent syntax in python would be:

female_values = values[gender=='Females']

Any thoughts?

Answer 1

var values = [.1, .3, .7, .8];
var gender = ['Males', 'Males', 'Females', 'Females'];

var males = [];
for (var i = 0; i < values.length; i++) {
  if (gender[i] == 'Males') {
    males.push(values[i]);
  }
}

The Array constructor is not usually used, use the array literal [] instead. Then simply loop through the arrays and push the value onto the third array if some condition that you set passes.

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And yeah this is more pain than python, although coffee script can make it a little nicer.