Standard Library Utilities

Set

Set stores unique values and ignores duplicates.

Set A `Set<T>` keeps only one copy of each value.

Set

extraTag
set.ts
Replay: real traced execution (multi-file project)
const extraTag: string = "typed";
const tags: Set<string> = new Set<string>(["typed", "web"]);

tags.add(extraTag);
tags.add("typed");

const hasRuntime: boolean = tags.has("runtime");
const summary: string = Array.from(tags).join(",");

console.log(`tags=${summary}`);
console.log(`runtime=${hasRuntime}`);

const extraTag: string = "runtime";
const tags: Set<string> = new Set<string>(["typed", "web"]);

tags.add(extraTag);
tags.add("typed");

const hasRuntime: boolean = tags.has("runtime");
const summary: string = Array.from(tags).join(",");

console.log(`tags=${summary}`);
console.log(`runtime=${hasRuntime}`);

const extraTag: string = "web";
const tags: Set<string> = new Set<string>(["typed", "web"]);

tags.add(extraTag);
tags.add("typed");

const hasRuntime: boolean = tags.has("runtime");
const summary: string = Array.from(tags).join(",");

console.log(`tags=${summary}`);
console.log(`runtime=${hasRuntime}`);

  1. extraTag ← typed, tags ← [object Set], hasRuntime ← false, summary ← typed,web

    1const extraTag→ typed: string = "typed";  //@extraTag="runtime", "web"2const tags→ [object Set]: Set<string> = new Set<string>(["typed", "web"]);34tags.add(extraTagtyped);5tags.add("typed");67const hasRuntime→ false: boolean = tags[object Set].has("runtime");8const summary→ typed,web: string = Array.from(tags[object Set]).join(",");910console.log(`tags=${summarytyped,web}`);11console.log(`runtime=${hasRuntimefalse}`);
    outputtags=typed,web
runtime=false

  1. extraTag ← runtime, tags ← [object Set], hasRuntime ← true, summary ← typed,web,runtime

    1const extraTag→ runtime: string = "runtime";2const tags→ [object Set]: Set<string> = new Set<string>(["typed", "web"]);34tags.add(extraTagruntime);5tags.add("typed");67const hasRuntime→ true: boolean = tags[object Set].has("runtime");8const summary→ typed,web,runtime: string = Array.from(tags[object Set]).join(",");910console.log(`tags=${summarytyped,web,runtime}`);11console.log(`runtime=${hasRuntimetrue}`);
    outputtags=typed,web,runtime
runtime=true

  1. extraTag ← web, tags ← [object Set], hasRuntime ← false, summary ← typed,web

    1const extraTag→ web: string = "web";2const tags→ [object Set]: Set<string> = new Set<string>(["typed", "web"]);34tags.add(extraTagweb);5tags.add("typed");67const hasRuntime→ false: boolean = tags[object Set].has("runtime");8const summary→ typed,web: string = Array.from(tags[object Set]).join(",");910console.log(`tags=${summarytyped,web}`);11console.log(`runtime=${hasRuntimefalse}`);
    outputtags=typed,web
runtime=false