LEARNING JAVASCRIPT - Trang 354

emitting events,

208

event categories,

270

event propagation,

267

listening for events,

209

multiple events,

266

support for,

208

EventEmitter,

208

events, asynchronous,

12

evergreen browsers,

16

,

257

every method (arrays),

137

exception handling

and call stacks,

171

anticipated vs. unanticipated errors,

169

communicating errors,

169

computational cost of,

174

Error object,

169

finally blocks,

173

generator runners and,

216

throwing errors,

171

unhandled/uncaught exceptions,

172

with try and catch,

170

exception statements,

68

executing functions,

103

execution context,

118

existence, vs. scope,

118

exit codes,

291

exponential notation,

230

exponentiation functions,

232

Express,

298

expressions

and control flow patterns,

100

conditional,

100

defined,

69

,

79

function expressions,

112

identifier expressions,

80

in template strings,

100

literal expressions,

80

vs. non-expression statements,

79

operator expressions,

80

order of execution,

80

types of,

80

uses for,

79

Extended Backus-Naur Form (EBNF),

69

extensions, preventing,

305

F

Fabric.js,

9

fall-through execution,

73

falsy values,

89

fat arrow notation (=>),

113

,

181

fatal errors,

291

file modules,

284

filename globbing,

246

files

creating,

5

,

289

loading,

7

filesystem access,

289

fill method (arrays),

135

filter function (arrays),

138

final expressions (in for loop),

65

finally blocks,

173

find method (arrays),

136

findIndex method (arrays),

136

first-level headers,

7

fixed-decimal numbers,

230

fixed-precision numbers,

39

,

230

floating-point types,

38

,

229

flowcharts,

55

,

57

,

78

focus events (HTML),

270

for loops,

11

,

64

,

70

forEach (arrays),

153

form events (HTML),

270

formal arguments,

105

,

117

forward slash (/) division operator,

17

forward slashes, double (//) comment,

4

,

238

for…in loops,

75

,

148

for…of loops,

75

,

164

FOUC (flash of unstyled content) problem,

274

freezing,

305

function keyword,

179

function modules,

287

Function object,

188

function replacements,

251

function variables

concept of,

191

functions in arrays,

193

passing functions into functions,

194

returning functions from functions,

195

uses for,

191

functions

aliasing,

192

anonymous functions,

112

apply keyword and,

115

arguments/parameters for,

105

-

109

arrow notation and,

113

as properties of objects,

109

bind keyword and,

116

body of,

103

330 | Index

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