How to use findIndex with strings and objects

Question

How can I use findIndex when I have a array of strings or objects. Both of the above code returns -1

console.log(['kk', 'll', 'mm', 'pp'].findIndex(function(x) { x == 'mm'}))
console.log([{name: 'kk'},{name: 'vv'},{name: 'mm'},{name: 'ok'}].findIndex(function(x) { x.name == 'mm'}))

jsfiddle

adeneo · Accepted Answer · 2016-10-20 18:22:21Z

6

You have to return the result of the condition so Array.findIndex knows if the value was found or not

['kk', 'll', 'mm', 'pp'].findIndex(function(x) { return x == 'mm'})

It should be noted that used like this, with an array of just strings, indexOf works just fine

['kk', 'll', 'mm', 'pp'].indexOf('mm')

but for an array of objects, as in the second example, it's very useful to have a callback

[
    {name: 'kk'},
    {name: 'vv'},
    {name: 'mm'},
    {name: 'ok'}
].findIndex(function(x) { 
    return x.name == 'mm';
});

answered Oct 20, 2016 at 18:22

adeneo

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