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Added function for partial application #13

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Added function for partial application #13

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14 changes: 13 additions & 1 deletion test/FunctionsTest.php
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Original file line number Diff line number Diff line change
Expand Up @@ -193,4 +193,16 @@ public function testAfter() {
$func();
$this->assertEquals('x', $str);
}
}

function testPartial() {
// partial once
$f = function( $x, $y ) { return $x + $y; };
$f2 = __::partial( $f, 2 );
$this->assertEquals( 5, $f2(3) );

// partial on a partial
$f3 = __::partial( $f2, 4 );
$this->assertEquals( 6, $f3() );
}

}
11 changes: 11 additions & 0 deletions underscore.php
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Original file line number Diff line number Diff line change
Expand Up @@ -1069,6 +1069,17 @@ public function after($count=null, $function=null) {
};
return self::_wrap(($count) ? $func : $func());
}


// creates a partially applied version of the function
public function partial() {
$origArgs = func_get_args();
$f = array_shift( $origArgs );
return function() use ( $f, $origArgs ) {
$allArgs = array_merge( $origArgs, func_get_args() );
return call_user_func_array( $f, $allArgs );
};
}


// Singleton
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