To find the first character of a string in JavaScript using bracket notation, you can use the following code:
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let str = "Hello World!"; let firstChar = str[0];
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This will assign the value "H" to the variable firstChar.
Bracket notation is used to access specific characters within a string. The number inside the brackets specifies the index of the character you want to access, where the index of the first character is 0, the index of the second character is 1, and so on.
For example, to get the third character of the string, you can use the following code:
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let thirdChar = str[2];
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This will assign the value "l" to the variable thirdChar.
You can also use negative indices with bracket notation to access characters from the end of the string. For example, to get the last character of the string, you can use the following code:
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let lastChar = str[-1];
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This will assign the value "!" to the variable lastChar.
To access a character at a specific index in a string, you can use the following syntax:
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string[index]
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Here, string is the string you want to access, and index is the index of the character you want to access. The index of the first character is 0, the index of the second character is 1, and so on.
For example, consider the following code:
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let str = "Hello World!"; let firstChar = str[0]; let thirdChar = str[2]; let lastChar = str[-1];
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This will assign the following values to the variables:
firstChar:"H"thirdChar:"l"lastChar:"!"
You can also use variables as indices when using bracket notation. For example:
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let str = "Hello World!"; let index = 3; let fourthChar = str[index];
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This will assign the value "l" to the variable fourthChar.
Note that if you try to access an index that is outside the range of the string, you will get a undefined value. For example:
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let str = "Hello World!"; let char = str[100];
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This will assign the value undefined to the variable char.
