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¿Cómo encontrar todos los índices de matrices que tienen un cierto valor con Javascript?

En el siguiente código de ejemplo, ¿cómo puedo encontrar todos los índices de cualquier matriz del año 2021 en las fechas? ¡Gracias por cualquier guía!

 function test() { const dates = [ 'October 31, 2020', 'November 30, 2020', 'December 31, 2020', 'January 31, 2021', 'February 28, 2021', 'March 31, 2021', ]; // How should the following code be changed to get indexes of any array of year 2021, which should be 3,4,5? // The following code returned only the first array index, 3, not 3,4,5. var indexes = dates.findIndex(el => el.includes('2021')); console.log(indexes); }
about 4 years ago · Juan Pablo Isaza
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Usar reducir :

 /*<ignore>*/console.config({maximize:true,timeStamps:false,autoScroll:false});/*</ignore>*/ function test() { const dates = [ 'October 31, 2020', 'November 30, 2020', 'December 31, 2020', 'January 31, 2021', 'February 28, 2021', 'March 31, 2021', ]; // The following code returned 3,4,5. var indexes = dates.reduce((acc,el,i) => el.includes('2021') ? [...acc,i] : acc,[]); console.log(indexes); } test()
 <!-- https://meta.stackoverflow.com/a/375985/ --> <script src="https://gh-canon.github.io/stack-snippet-console/console.min.js"></script>

about 4 years ago · Juan Pablo Isaza Report
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