Generator: send value to a generator

Pass a value to a generator

basics: get the values from a generator in two ways

function* generatorFunction() { yield 1; yield 2; } // way #1 var convertedToAnArray = Array.from(generatorFunction()); // way #2 var iterator = generatorFunction(); var iteratedOver = [iterator.next().___, iterator.___]; assert.deepEqual(iteratedOver, convertedToAnArray);

pass a value to the iterator

function* generatorFunction() { yield 1; yield param; } var iterator = generatorFunction(); var iteratedOver = [iterator.next().value, iterator.next(2).value]; assert.deepEqual(iteratedOver, [1, 2]);

a value passed to the 1st next() call is ignored

function* generatorFunction() { yield 1; } let iterator = generatorFunction(); const values = [ iterator.next('irrelevant').value, iterator.next(2).value ]; assert.deepEqual(values, [1, 2]);

Links

spec The part in the spec, that describes how a generator resumes.

Required Knowledge

• `let` declaration (Block scope)
• creation (Generator)
• iterator (Generator)
• yield expressions (Generator)

Related Katas

Generator

• creation
• iterator
• yield expressions
• send value to a generator
• send function to a generator
• return inside a generator function
• send return to a generator

Difficulty Level

ADVANCED

First Published

18 June 2015

Stats

3 tests to solve