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javascriptarraysprefix

how to replace list of elements in an array with index value, if element has specific prefix of Xyz in javascript

how to replace list of elements in an array with an index value, if the element has a specific prefix of Xyz in javascript. I need to find the items in an array that has john as a prefix and replace them with the index values. note: only string with a prefix of xyz is valid for example input: arrNames[john, jack, johnsmith, funjack, john]. output: [john,jack,2,funjack,john]

I tried with the indexOf method but didn't get the expected result.

Solution

  • Hope this is your goal

    const arrNames=['john', 'jack', 'johnsmith', 'funjack', 'john'];

arrNames.map(x => x.startsWith('john') && x !== 'john' ? arrNames.findIndex(f => f===x):x)