vanilla-lib

Vanilla JS library
当前为 2018-06-12 提交的版本，查看最新版本。
此脚本不应直接安装。它是供其他脚本使用的外部库，要使用该库请加入元指令 // @require https://update.greasyforks.org/scripts/369430/604970/vanilla-lib.js
换行
/* vanilla-lib */
var  mapFlat = ( array,func ) => array.map( x => func(x) ).reduce( (a,b) => a.concat(b) ),
     parenth = ( elem,nth ) => traverse(elem, ifndef(nth, 1), 0), //( ! elem ? null : elem.parentNode ),
     ifndef  = ( expr,value ) => ( ndef(expr) ? value : expr ),
     ifnan   = ( expr,value ) => ( isNaN(expr) ? value : expr ),
     isarr   = expr => ( 'object' === typeof expr && Array === expr.constructor ),
     isfn    = expr => ( 'function' === typeof expr ),
     ndef    = expr => ( 'undefined' === typeof expr ),
     test    = ( expr,func,other ) => ( !! expr ? func(expr) : isfn(other) ? other(expr) : other ),
     log     = console.debug,
     on      = ( elem,event,func ) => elem.addEventListener(event, func),
     $$      = ( sel,elem ) => Array.slice((elem || document).querySelectorAll(sel)),
     $       = ( sel,elem ) => (elem || document).querySelector(sel);

var  aggrate = ( amount,rate,periods ) => ( ! periods ? amount : aggrate(amount * rate, rate, periods - 1) ),
     toDec   = expr => ( Math.round(parseFloat((expr +'').replace(/\$|,/g, '')) * 100) / 100 ),
     toMny   = amount => ( (segs => isNaN(segs[ 0 ]) ? null : '$ '+ segs[ 0 ] +'.'+ ((segs[ 1 ] || 0) +'00').slice(0, 2)) ((toDec(amount) +'').split('.')) );

//Array.prototype.mapFlat = function( func ) { return  mapFlat(this, func); };

function  adopt( elem, sibling, position ) {
	let  wrap = parenth(elem);
	// Look for the reference point (for 'insertBefore' function); null = use 'append' instead
	elem = ( position < 0 ? traverse(elem, 0, position, true) : traverse(elem, 0, (position || 0) + 1, false) );
	if ( ! elem ) {
		wrap.append(sibling);
	} else {
		wrap.insertBefore(sibling, elem);
	}
	// Return the element added
	return  sibling;
}

function  attr( elem, name, value ) {
	if ( isarr(elem) ) {
		return  elem.map( el => attr(el, name, value) );
	}

	if ( null === value ) {
		elem.removeAttribute(name);
	} else {
		elem.setAttribute(name, value);
	}
	return  elem;
}

function  create( html, containerType ) {
	let  container = null,
	     result    = null;
	containerType = containerType || 'div';
	create[ containerType ] = 
	container               = create[ containerType ] || document.createElement(containerType);
	container.innerHTML = html;
	result = Array.slice(container.childNodes)
	         	.map( elem => (elem.remove(), elem) );
	if ( 1 == result.length ) {
		result = result[ 0 ];
	}
	return  result;
}

function  traverse( elem, up, sideways, elementsOnly, lastIfNull ) {
	let  last = elem;
	while ( !! elem && up -- > 0 )  elem = (last = elem, parenth(elem));

	let  prop = ( elementsOnly ? 'Element' : '' ) +'Sibling';
	if ( sideways < 0 ) {
		while ( !! elem && sideways ++ < 0 )  elem = (last = elem, elem[ 'previous'+ prop ]);
	} else if ( sideways > 0 ) {
		while ( !! elem && sideways -- > 0 )  elem = (last = elem, elem[ 'next'+ prop ]);
	}

	return  ( ! lastIfNull ? elem : elem || last );
}