{"ScriptPreparationCode":"var playlist = [];\r\nfor (let i=0; i\u003C1000; i\u002B\u002B){\r\n playlist.push({title: \u0022\u0022, artist: \u0022\u0022, src:\u0060/${i}\u0060});\r\n}","TestCases":[{"Name":"findIndex","Code":"var index = playlist.findIndex(item =\u003E item.src === \u0022/450\u0022);\r\nplaylist[index] = { title: \u0027b\u0027, artist:\u0022b\u0022, src: \u0022/450\u0022};","IsDeferred":false},{"Name":"map","Code":"var arr = playlist.map(item =\u003E {\r\n if(item.src === \u0022/450\u0022){\r\n return { title: \u0027b\u0027, artist:\u0022b\u0022, src: \u0022/450\u0022};\r\n }\r\n return item;\r\n});","IsDeferred":false}]}