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i have this loop. now, in a[i] im putting name of college, for example UCLA. in temp i have the name of the player i want to insert into the a[i][p]

When im looking at temp im seeing the name that i actualy wants to insert, but them im doing this line a[i][p] = temp; im seeing in a[0][0]='U', why?

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var a = [[]];
var p = 0;
var temp;

for (var i = 0; i < uniq.length; i++) {
    a[i] = uniq[i];
    for (var k = 0; k < data.players.length; k++) {

        if (uniq[i] == data.players[k].college) 
        {
            temp = data.players[k].name
            a[i][p] = temp;
            p++;
        }
    }
    p = 0;

}
console.log(a[0][0])
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  • With a[0][0] you are accessing the first element of the first element of a. a is in fact an array, so with a[0] you are accessing the first array value of a. In your case this is a string (not an array!). So with a[0][0] you get the first value of the string, which happens to be a 'U'. Commented Mar 17, 2022 at 16:57

2 Answers 2

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The answer is:

  1. first you put UCLA as the value of a[0]

now your array looks like this:

console.log(a[0]) // expected "UCLA"
  1. strings in JavaScript can be iterated over - this means (roughly), that you can get a[0][0] in this case: the first item of the first item of the a array - and that is "the first character of the string at the first index in a"
console.log(a[0][0]) // expected: "U", if a[0] is "UCLA"


const a = []
a[0] = "UCLA"

console.log(a)
console.log(a[0])
console.log(a[0][0])

You need to do it a bit differently (this could be one approach, but there could be more):

const a = {} // this is an object, not an array!

a["UCLA"] = "name of tthe player"

console.log(a)
console.log(a["UCLA"])

Or, if you need an array, then you could do:

const a = []

a[0] = { uni: "UCLA", player: [] }

a[0].player[0] = "name of the player"

console.log(a)

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when indexing JavaScript strings they behave like arrays and you actually get a 1 letter string with the character on the index you requested

for example:

var dummy = "house";
console.log(dummy[1]);
//this is going to return o (character in index 1 of house)

note that when indexing a string you are going to get another string and not a char like in other languages,

to achieve what you are trying to do you can use a dictionary like this:

var schools = {};
for (var i = 0; i < uniq.length; i++) {
    schools[uniq[i]] = [];
    for (var k = 0; k < data.players.length; k++) {

        if (uniq[i] == data.players[k].college) 
        {
            schools[uniq[i]].push(data.players[k].name);
        }
    }
}

at the end of this you can access schools either by indexing, by string key (college name) or with a simple foreach

schools[1]; //this is gonna give ["firstname","secondname","etc"] (player names of the second school)
schools["UCLA"]; //this is gonna give ["firstname","secondname","etc"] (player names of UCLA school)
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