I need to pass array as argument to contract constructor using truffle deployment script.

My contract code looks like this:

pragma solidity ^0.5.0;

contract ArrayArgument {
    uint[] public arrsv;

    constructor(uint[] memory arr) public {
        for(uint i=0; i< arr.length; i++)
            arrsv[i] = arr[i];

    function fetcharrayindexvalue(uint index) public view returns (uint)
        return arrsv[index];

My deployment script looks like this:

var ArrayArgument = artifacts.require("ArrayArgument");

module.exports = function (deployer) {
    deployer.deploy(ArrayArgument, [10, 12, 35]);

But when I try to migrate my contract, I get the following error:

Error:  *** Deployment Failed ***

"ArrayArgument" hit an invalid opcode while deploying. Try:
   * Verifying that your constructor params satisfy all assert conditions.
   * Verifying your constructor code doesn't access an array out of bounds.
   * Adding reason strings to your assert statements.

  at C:\Users\Saurab Marjara\AppData\Roaming\npm\node_modules\truffle\build\webpack:\packages\truffle-deployer\src\deployment.js:364:1
  at <anonymous>
  at process._tickCallback (internal/process/next_tick.js:188:7)
Truffle v5.0.8 (core: 5.0.8)
Node v8.10.0

How do I pass an array argument to a contract constructor from the deployment script ?

1 Answer 1


The "ArrayArgument" hit an invalid opcode while deploying error is due to a problem which occurs during runtime (i.e., not because of how you pass the array to the constructor).

The problem is that the initial length of the dynamic array uint[] public arrsv is 0.

So you cannot access (neither read nor write) elements in this array via arrsv[i].

Change this:

arrsv[i] = arr[i];

To this:

  • thank you so much. I was really at my wit's end regarding this..... again thank you. Commented Feb 8, 2020 at 8:51
  • @saurabmarjara: You're welcome. What does wit's end mean? Commented Feb 8, 2020 at 8:52
  • :) wit's end means not knowing what to do next Commented Feb 9, 2020 at 6:32

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