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¿Cómo encuentro la posición de una matriz que está en una propiedad de un objeto?

Para el código a continuación, traté de obtener la posición de Time Square en la línea "N" , que es 0 , sin embargo, cuando ejecuto mi código, muestra: startLine.indexof is not a function .

 const mta = { subwayLines: { N: ["Times Square", "34th", "28th", "23rd", "Union Square", "8th"], L: ["8th", "6th", "Union Square", "3rd", "1st"], SIX: ["Grand Central", "33rd", "28th", "23rd", "Union Square", "Astor Place"] }, findStartIndex: function(station, line) { if (line in this.subwayLines) { let startLine = this.subwayLines[line]; let indexOfStart = startLine.indexof(station); console.log(indexOfStart); } } }

¿Cómo soluciono este código? Gracias.

about 4 years ago · Juan Pablo Isaza
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