ifthen

If a condition is truthy, invoke x; otherwise, invoke y.

Usage

var ifthen = require( '@stdlib/utils/if-then' );

ifthen( bool, x, y )

If a condition is truthy, invokes x; otherwise, invokes y.

function x() {
    return 1.0;
}

function y() {
    return -1.0;
}

var z = ifthen( true, x, y );
// returns 1.0

z = ifthen( false, x, y );
// returns -1.0

Notes

  • The function is similar to ifelse(), but allows deferred argument evaluation.

Examples

var randu = require( '@stdlib/random/base/randu' );
var ceil = require( '@stdlib/math/base/special/ceil' );
var repeatString = require( '@stdlib/string/repeat' );
var ifthen = require( '@stdlib/utils/if-then' );

var z;
var i;

function x() {
    return repeatString( 'BOOP', ceil( randu()*3.0 ) );
}

function y() {
    return repeatString( 'beep', ceil( randu()*5.0 ) );
}

for ( i = 0; i < 100; i++ ) {
    z = ifthen( randu() > 0.9, x, y );
    console.log( z );
}