countSameValue

Count the number of elements in an array that are equal to a specified value.

Usage

var countSameValue = require( '@stdlib/array/base/count-same-value' );

countSameValue( x, value )

Counts the number of elements in an array that are equal to a specified value.

var x = [ 0, 1, 0, 1, 2 ];

var out = countSameValue( x, 1 );
// returns 2

In contrast to an implementation using the strict equality operator ===, the function distinguishes between +0 and -0 and treats NaNs as the same value.

var x = [ NaN, NaN, NaN ];

var out = countSameValue( x, NaN );
// returns 3

Notes

The function uses the SameValue Algorithm as specified in ECMAScript 5.

Examples

var bernoulli = require( '@stdlib/random/array/bernoulli' );
var countSameValue = require( '@stdlib/array/base/count-same-value' );

var x = bernoulli( 10, 0.5, {
    'dtype': 'generic'
});
console.log( x );

var n = countSameValue( x, 1 );
console.log( n );