Page 56 - Nodejs 교과서 개정2판

const y = 3;
}
console.log(y); // Uncaught ReferenceError: y is not defined

௏٘ח ௼܁ ѐߊ੗ بҳ ' ੄ $POTPMF చী ੸ਵݶ ؾפ׮ &OUFS ܳ ־ܰݶ ௏٘о प೯غחؘ ௏٘ܳ प
೯ೞ૑ ঋҊ ઴߄Էਸ ೞ۰ݶ 4IJGU &OUFS ܳ ੑ۱೤פ׮

xח ੿࢚੸ਵ۽ ୹۱غחؘ yח ী۞о ߊࢤ೤פ׮ varਸ const۽ ߄Ծਸ ࡺੋؘ ର੉о ߊࢤೞח Ѫੑפ׮ v

ar਷ ೣࣻ झ௏೐ܳ о૑޲۽ ifޙ੄ ࠶۾җ ҙ҅হ੉ ੽Ӕೡ ࣻ ੓णפ׮ ೞ૑݅ DPOTU৬ let਷ ࠶۾ झ௏೐

ܳ о૑޲۽ ࠶۾ ߆ীࢲח ߸ࣻী ੽Ӕೡ ࣻ হणפ׮ ࠶۾੄ ߧਤח if while for function ١ীࢲ ࠅ ࣻ
੓ח ઺Қഐ \৬ ^ ࢎ੉ ੑפ׮ ೣࣻ झ௏೐ ؀न ࠶۾ झ௏೐ܳ ࢎਊೣਵ۽ॄ ഐ੉झ౴ э਷ ޙઁب ೧ѾغҊ

௏٘ ҙܻب ࣻਘ೧઎णפ׮

const letҗ var਷ झ௏೐ ઙܨо ׮ܵפ׮ Ӓۧ׮ݶ const৬ let р੄ ର੉ח ޖ঺ੌөਃ constח ೠ ߣ ч

ਸ ೡ׼ೞݶ ׮ܲ чਸ ೡ׼ೡ ࣻ হणפ׮ ׮ܲ чਸ ೡ׼ೞ۰Ҋ ೞݶ ী۞о ߊࢤ೤פ׮ ژೠ ୡӝചೡ ٸ
чਸ ೡ׼ೞ૑ ঋਵݶ ী۞о ߊࢤ೤פ׮ ٮۄࢲ const۽ ࢶ঱ೠ ߸ࣻܳ ࢚ࣻۄҊ ࠗܰӝب ೤פ׮

׮਺ ৘ઁܳ ೠ ઴ঀ ٮۄ ੑ۱೧ࠁࣁਃ

const a = 0;
a = 1; // Uncaught TypeError: Assignment to constant variable.

let b = 0;
b = 1; // 1

const c; // Uncaught SyntaxError: Missing initializer in const declaration

/PUF ™ DPOTU৬ MFU ઺ী যו Ѫਸ ॄঠ ೞաਃ

੗߄झ௼݀౟ܳ ࢎਊೡ ٸ ೠ ߣ ୡӝച೮؍ ߸ࣻী ׮ܲ чਸ ೡ׼ೞח ҃਋ח ੄৻۽ ੸णפ׮ ٮۄࢲ ߸ࣻ ࢶ঱ दীח ӝ
ࠄ੸ਵ۽ constܳ ࢎਊೞҊ ׮ܲ чਸ ೡ׼೧ঠ ೞח ࢚ട੉ ࢤ҂ਸ ٸ letਸ ࢎਊೞݶ ؾפ׮

మ೒݁ ޙ੗ৌ

&4 ޙߨী ࢜۽਍ ޙ੗ৌ੉ ࢤ҂णפ׮ ੉ ޙ੗ৌ਷ ௾ٮ১಴ա ੘਷ٮ১಴۽ хऱח ӝઓ ޙ੗ৌҗ ׮ܰ

ѱ ߔ౮ A ਵ۽ хषפ׮ 5BC ਤী ੓णפ׮ ౠ੉ೠ ੼਷ ޙ੗ৌ উী ߸ࣻܳ ֍ਸ ࣻ ੓׮ח Ѫੑפ׮

׮਺਷ ӝઓ &4 ޙߨਸ ࢎਊೠ ޙ੗ৌੑפ׮