BiteSizedChunks.comLearn one small thing at a time.

Course contentsShow

145String Literals: Single and Double Quotes
146Escape Sequences in Strings
147Multi-line Strings with Backslashes
148Template Literal Syntax
149Expression Interpolation with ${}
150Multi-line Strings with Template Literals
151Nesting Template Literals
152Tagged Template Literals
153Raw Strings with String.raw
154Common Use Cases for Template Literals
155Performance: Concatenation vs Template Literals
156includes(): Checking for Substrings
157startsWith() and endsWith()
158indexOf(): Finding the First Occurrence
159lastIndexOf(): Finding from the End
160search() with Regular Expressions
161match(): Extracting Pattern Matches
162matchAll(): Iterating Over All Matches
163test() on RegExp Objects
164Case-Insensitive Searching
165Position Parameters in Search Methods
166Global vs Non-Global Regex Matches
167Common Pitfalls with indexOf() and -1
168Choosing the Right Search Method
169Converting Case with toLowerCase and toUpperCase
170Trimming Whitespace with trim, trimStart, and trimEnd
171Replacing Substrings with replace
172Replacing All Occurrences with replaceAll
173Splitting Strings into Arrays with split
174Extracting Substrings with slice
175Extracting with substring and substr
176Repeating Strings with repeat
177Padding Strings with padStart and padEnd
178Concatenating with concat and the + Operator
179Normalizing Unicode with normalize
180Replacement Functions and Capture Groups
181Chaining String Transformations
182Immutability: All Methods Return New Strings
183What is Unicode and Why It Matters
184Code Points vs Code Units
185Surrogate Pairs and the BMP
186String Length and Surrogate Pairs
187Accessing Characters with charAt vs Bracket Notation
188CodePointAt and CharCodeAt
189String.fromCodePoint vs String.fromCharCode
190Iterating Strings with For...of
191Spread Operator and Array.from for String Splitting

145String Literals: Single and Double Quotes
146Escape Sequences in Strings
147Multi-line Strings with Backslashes
148Template Literal Syntax
149Expression Interpolation with ${}
150Multi-line Strings with Template Literals
151Nesting Template Literals
152Tagged Template Literals
153Raw Strings with String.raw
154Common Use Cases for Template Literals
155Performance: Concatenation vs Template Literals
156includes(): Checking for Substrings
157startsWith() and endsWith()
158indexOf(): Finding the First Occurrence
159lastIndexOf(): Finding from the End
160search() with Regular Expressions
161match(): Extracting Pattern Matches
162matchAll(): Iterating Over All Matches
163test() on RegExp Objects
164Case-Insensitive Searching
165Position Parameters in Search Methods
166Global vs Non-Global Regex Matches
167Common Pitfalls with indexOf() and -1
168Choosing the Right Search Method
169Converting Case with toLowerCase and toUpperCase
170Trimming Whitespace with trim, trimStart, and trimEnd
171Replacing Substrings with replace
172Replacing All Occurrences with replaceAll
173Splitting Strings into Arrays with split
174Extracting Substrings with slice
175Extracting with substring and substr
176Repeating Strings with repeat
177Padding Strings with padStart and padEnd
178Concatenating with concat and the + Operator
179Normalizing Unicode with normalize
180Replacement Functions and Capture Groups
181Chaining String Transformations
182Immutability: All Methods Return New Strings
183What is Unicode and Why It Matters
184Code Points vs Code Units
185Surrogate Pairs and the BMP
186String Length and Surrogate Pairs
187Accessing Characters with charAt vs Bracket Notation
188CodePointAt and CharCodeAt
189String.fromCodePoint vs String.fromCharCode
190Iterating Strings with For...of
191Spread Operator and Array.from for String Splitting

Lesson 158 of 2,723·5. StringsPro lesson

indexOf(): Finding the First Occurrence

Locate the position of the first occurrence of a substring, or -1 if not found.

This lesson is for subscribers

You've completed the free preview. Subscribe to unlock every lesson in every course.

See pricing Back to course