JavaScript TypeError: contract is not a function

Asked Jul 19 '18 at 18:50

Active Jul 19 '18 at 19:08

Viewed 268 times

So I have two .js files. This is the contract function inside contract.js file:

function contract(preList, post, f) {
// ***YOUR CODE HERE***
     for(let i in preList){
       if (! preList[i]){
        throw " Contract violation in position 1." +
        "Expected number but received four.  Blame -> Top-level code";
       }
     }
      if(!post){
       throw " Contract violation in position 1." +
       "Expected number but returned undefined. Blame -> brokenMult";
      }
     return f;
    }

I am trying to involving above contract function:

var contracts = require('contracts');
var contract = contracts.contract;
var isNumber = contracts.isNumber;

   var mult = contract(
     [isNumber, isNumber],
     isNumber,
     function mult (x, y) {
     return x+y;
     });

   var brokenMult = contract(
     [isNumber, isNumber],
     isNumber,
     function brokenMult(x, y) {
     return undefined;
     });

This is where exporting contract function inside contracts.js

    module.exports = {
      contract: contract,
      any: any,
      isBoolean: isBoolean,
      isDefined: isDefined,
      isNumber: isNumber,
      isPositive: isPositive,
      isNegative: isNegative,
      isInteger: Number.isInteger,
      isString: isString,
      and: and,
      or: or,
      not: not,
      };

For somehow reason TypeError: contract is not a function

edited Jul 19 '18 at 19:08

Jonas Wilms

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asked Jul 19 '18 at 18:50

Rui Yang

3

Have you exported it? – Jonas Wilms Jul 19 '18 at 18:52
Yeah. I did I link two files together using $npm link. – Rui Yang Jul 19 '18 at 18:53
Thats something else. – Jonas Wilms Jul 19 '18 at 18:54
I just check the codes. exporting already been done. I added the code block where contract exported – Rui Yang Jul 19 '18 at 19:07
What does `console.log(require("contracts"))` return? – Jonas Wilms Jul 19 '18 at 19:09
it returns a bunch of environment, filters and formats. – Rui Yang Jul 19 '18 at 19:19
And also `contracts` ? Otherwise the importing went wrong – Jonas Wilms Jul 19 '18 at 19:20
console.log(contracts) returns the same as console.log(require("contracts")). – Rui Yang Jul 19 '18 at 19:24
I mean does it really import what you wanted? – Jonas Wilms Jul 19 '18 at 19:25

JavaScript TypeError: contract is not a function

0 Answers0