javascript - undefined parameter in js -


i receiving type error stating array testa[i] undefined whenever add input html page. have array set , i'm trying add value of currency array using push method add second part of array i.e([0][currency]) 

function test() {  var testa = []; (i = 0; < 4; i++) {         this.currency = prompt("please enter 3-letter currency abbreviation", "");         testa[i].push(currency);         } } var index = new test();

enter image description here

any why array undefined appreciated.

note: have tried both testa.push(currency) , testa[i] = this.currency, , still same error before.

note: final version should have loop through 4 different questions asked , each time adding these array. @ end of loop new variant of array should made , new set of data entered added it. for(i = 0; < 4; i++) { testa[i] = i; for(j = 0; j < 4; j++) { this.currency = prompt("please enter 3-letter currency abbreviation", ""); testa[i][j] = this.currency; } }

but @ point in time i'm trying work.

you don't use push method on index. use on array itself.

replace this

testa[i].push(currency);

with this

testa.push(currency);

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