前言 滿打滿算的話餐曼，從事iOS開發(fā)已經(jīng)快有兩年了似枕。工作到現(xiàn)在拱雏，從未寫過什么技術(shù)文章發(fā)表在網(wǎng)絡(luò)上，一方面是技術(shù)不到家，另一方面則是語文不好（上學(xué)的...

反身代詞（某人自己） myself yourself herself himself itself yourselves ourselves t...

形容詞性物主代詞： This is my book. We love our motherload Those are your socks(襪...

主格代詞 I am a teacher. He is a teacher. You are teachers. 賓格代詞 He likes me...

Be動(dòng)詞的否定 The man isn't back I am not back. They aren't back. He wasn't ba...

Be 動(dòng)詞的形式 be, is ,am, are, was, were, being been The man is back They are...

基本句式一：S V (主謂) 基本句式二：S V P (主系表) 基本句式三：SVO （主謂賓） 基本句式四：SVoO （主謂間接賓語直接賓語）...

1.map和flatmap可以對(duì)數(shù)組中的每一個(gè)元素進(jìn)行操作盒件。2.flatmap可以過濾掉nil。3.flatmap可以對(duì)數(shù)組進(jìn)行降維舱禽。

實(shí)習(xí)了快半年了炒刁，前天遇到了一個(gè)文字，我將另外一個(gè)數(shù)組賦值給某個(gè)數(shù)組誊稚∠枋迹可以怎么都為空∑酰可是打上斷點(diǎn)卻有數(shù)據(jù)。經(jīng)過指導(dǎo)才發(fā)現(xiàn)原來是數(shù)組沒有初始化协屡。我...