concat function in javascript?

Question

i want to pick highest value from an array so i use math.max function it is working well when i run this only with one array but as i have two different array to first of all i want to join them together so i use concat function but it is not working.

<html xmlns="http://www.w3.org/1999/xhtml">
<head>


<script type="text/javascript">

var maX=[6,1]

var miN=[10,20]

alert(Math.max.apply(maX.concat(miN))


</script>
</head>

<body>
</body>
</html>

hugomg · Accepted Answer · 2012-03-16T04:10:10.877

4

apply receives two arguments: the "this" and the argument list. Try

Math.max.apply(null, maX.concat(miN) )

or

Math.max.apply(Math, maX.concat(miN) )

edited Mar 16 '12 at 04:10

answered Mar 16 '12 at 04:03

hugomg

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i give them two argument but it is not wokring alert(Math.max.apply(null,maX.concat(miN)) – Jitender Mar 16 '12 at 04:04
@amit You need one more closing bracket. – Chirag Mar 16 '12 at 04:07
@amit: It works for me. Are you using IE by any chance? Also, use the developer console and console.log to test stuff like this instead of `alert`. Its better in many ways. – hugomg Mar 16 '12 at 04:07
yes you are right sir, thank u so much, sir one more help i required from your side. actully i am new to this field so i did not aware about console log and developer console can u tell me something about it and how to use it – Jitender Mar 16 '12 at 04:12
Depends on what browser you are using. In crome, IE and Safari just press F12. In Firefox you need to download the Firebug addon. – hugomg Mar 16 '12 at 04:17

score 1 · Answer 2 · edited Mar 16 '12 at 04:09

1

The first argument to apply is the value of this, not a parameter. Try

Math.max.apply(Math, maX.concat(miN))

edited Mar 16 '12 at 04:09

david

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answered Mar 16 '12 at 04:03

Mike Samuel

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score 0 · Answer 3 · edited May 23 '17 at 11:56

0

to concat two arrays: var joinedarray = array1.concat(array2)

then do max on the joinedarray EDIT: to do the Math.max on the array refference this answer: JavaScript: min & max Array values?

edited May 23 '17 at 11:56

Community

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answered Mar 16 '12 at 04:06

dbrin

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If you pass an array to max you just get NaN back – hugomg Mar 16 '12 at 04:09
correct to do the Math.max on the array refference this answer: http://stackoverflow.com/questions/1669190/javascript-min-max-array-values – dbrin Mar 16 '12 at 04:12

score 0 · Answer 4 · answered Mar 16 '12 at 04:07

The following code concatenates two arrays:

var alpha = ["a", "b", "c"];  
var numeric = [1, 2, 3];  

// creates array ["a", "b", "c", 1, 2, 3]; alpha and numeric are unchanged  
var alphaNumeric = alpha.concat(numeric);

The following code concatenates three arrays:

var num1 = [1, 2, 3];  
var num2 = [4, 5, 6];  
var num3 = [7, 8, 9];



// creates array [1, 2, 3, 4, 5, 6, 7, 8, 9]; num1, num2, num3 are unchanged  


 var nums = num1.concat(num2, num3);

The following code concatenates three values to an array:

var alpha = ['a', 'b', 'c'];  

// creates array ["a", "b", "c", 1, 2, 3], leaving alpha unchanged  
var alphaNumeric = alpha.concat(1, [2, 3]);

concat function in javascript?

4 Answers4