find-index

v0.9.6

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Passing

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PUBLISHED

5 years ago

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1 KB

Returns the index of the first element of the list which matches the predicate, or `-1` if no element matches.

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findIndex (

fn:Function,

list:Array

) : Number

Returns the index of the first element of the list which matches the predicate, or -1 if no element matches.

Acts as a transducer if a transformer is given in list position.

Example

const xs = [{a: 1}, {a: 2}, {a: 3}];
     R.findIndex(R.propEq('a', 2))(xs); //=> 1
     R.findIndex(R.propEq('a', 4))(xs); //=> -1

Arguments

fn: Function

The predicate function used to determine if the element is the desired one.

list: Array

The array to consider.

Returns

Number

The index of the element found, or `-1`.