Pushing multiple variables into single function Javascript

Question

I've created a function that takes in a variable and returns the last value in the variables array. How do I push multiple variables arrays to go through the function? It works for var arr but not pzz?

var arr = ['abc', 'def', 'ghi'];
var pzz = ['jkl', 'lmn', 'opq'];
    
      
    function valueIn(v) {
        vLength = v.length;
    
        console.log(v[vLength-1]);
    
    }

    
valueIn(arr);

Thanks works great. Just out of interest is there a way to loop through the script to identify all the declared variables in the global scope? — NS01
– NS01, Commented May 2, 2018 at 1:11
Ideally, you shouldn't have any variables in the global scope except for the built-in ones. If you want to iterate over a bunch of variables, then just assign them to an array in advance. const myArrs = [arr, pzz]; — CertainPerformance
– CertainPerformance, Commented May 2, 2018 at 1:12
@NS01 Especially, you shouldn’t have any unknown variable names. If you want dynamic names, use an object instead: let obj = {arr, pzz}, then get obj.arr, or use one of the Object methods to iterate through them. — Sebastian Simon
– Sebastian Simon, Commented May 2, 2018 at 1:19

BenD · Accepted Answer · 2018-05-02 01:28:02Z

1

One way to do this is to use the js Arguments object to access every argument sent. reference.

var arr = ['abc', 'def', 'ghi'];
var pzz = ['jkl', 'lmn', 'opq'];
    
function valueIn() {
   for (i = 0; i < arguments.length; i++) {
      v = arguments[i];
      console.log(v[v.length - 1]);
   }
}
   
valueIn(arr, pzz);

A second way to do this is to use the spread operator. reference.

var arr = ['abc', 'def', 'ghi'];
var pzz = ['jkl', 'lmn', 'opq'];
    
function valueIn(...args) {
   for (i = 0; i < args.length; i++) {
      v = args[i];
      console.log(v[v.length - 1]);
   }
}
   
valueIn(arr, pzz);

edited May 2, 2018 at 1:28

answered May 2, 2018 at 1:22

BenD

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Comments

Joshua Rose · Accepted Answer · 2018-05-02 01:31:53Z

The following code assumes your intent is to write to the console. @CertainPerformance is correct to recommend to run a for each loop. However, I would recommend pushing the values to another array so you can run it as needed.

var valueInArray = [];
var arr = ['abc', 'def', 'ghi'];
var pzz = ['jkl', 'lmn', 'opq'];
valueInArray.push(arr, pzz);

function valueIn(v) {
  vLength = v.length;

  console.log(v[vLength - 1]);

}


valueInArray.forEach(function(el) {
  valueIn(el);
});

And in ES6

var valueInArray = [];
var arr = ['abc', 'def', 'ghi'];
var pzz = ['jkl', 'lmn', 'opq'];
valueInArray.push(arr, pzz);

function valueIn(v) {
  vLength = v.length;

  console.log(v[vLength - 1]);

}


valueInArray.forEach(el => (valueIn(el)));

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