mwe mwe - 1 month ago 20
TypeScript Question

Iterating over Typescript Map

I'm trying to iterate over a typescript map but I keep getting errors and I could not find any solution yet for such a trivial problem.

My code is:

myMap : Map<string, boolean>;
for(let key of myMap.keys()) {
console.log(key);
}


And I get the Error:


Type 'IterableIteratorShim<[string, boolean]>' is not an array type or a string type.


Full Stack Trace:


Error: Typescript found the following errors:
/home/project/tmp/broccoli_type_script_compiler-input_base_path-q4GtzHgb.tmp/0/src/app/project/project-data.service.ts (21, 20): Type 'IterableIteratorShim<[string, boolean]>' is not an array type or a string type.
at BroccoliTypeScriptCompiler._doIncrementalBuild (/home/project/node_modules/angular-cli/lib/broccoli/broccoli-typescript.js:115:19)
at BroccoliTypeScriptCompiler.build (/home/project/node_modules/angular-cli/lib/broccoli/broccoli-typescript.js:43:10)
at /home/project/node_modules/broccoli-caching-writer/index.js:152:21
at lib$rsvp$$internal$$tryCatch (/home/project/node_modules/rsvp/dist/rsvp.js:1036:16)
at lib$rsvp$$internal$$invokeCallback (/home/project/node_modules/rsvp/dist/rsvp.js:1048:17)
at lib$rsvp$$internal$$publish (/home/project/node_modules/rsvp/dist/rsvp.js:1019:11)
at lib$rsvp$asap$$flush (/home/project/node_modules/rsvp/dist/rsvp.js:1198:9)
at _combinedTickCallback (internal/process/next_tick.js:67:7)
at process._tickCallback (internal/process/next_tick.js:98:9)


I'm using angular-cli beta5 and typescript 1.8.10 and my target is es5.
Has anyone had this Problem?

Answer

You could use Map.prototype.forEach((value, key, map) => void, thisArg?) : void instead

Use it like this:

myMap.forEach((value: string, key: boolean) => {
    console.log(key, value);
});
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