Provide a descriptive of methods in JavaScript object.
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Method
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Description
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charAt()
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returns the character at the specified index
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concat()
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joins two or more strings, and returns a copy of the joined strings
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indexOf()
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returns the position of the first found occurence of a specified value in a string
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lastIndexOf()
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returns the position of the last found occurence of a specified value in a string
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replace()
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searches for a match between a substring (or regex) and a string, and replaces the matched substring with a new substring
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search()
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searches for a match between a regex and a string, and returns the position of the match
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slice()
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extracts a part of a string and returns a new string
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split()
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splits a string into an array of substrings
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substr()
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extracts the characters from a string, beginning at a specified start position, and through the specified number of character
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substring()
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extracts the characters from a string, between two specified indices
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toLowerCase()
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converts a string to lowercase letters
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toUpperCase()
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converts a string to uppercase letters
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trim()
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removes whitespace from both ends of a string
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valueOf()
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returns the primitive value of a String object
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toString()
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returns the value of a String object
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Method
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Description
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abs(x)
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returns the absolute value of x
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round(x)
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rounds x to the nearest integer
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ceil(x)
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returns x, upwards to the nearest integer
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floor(x)
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returns x, rounded downwards to the nearest integer
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exp(x)
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returns the value of Ex
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log(x)
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returns the narural logarithm (base E) of x
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max(x, y, z, ...)
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returns the number with the highest value
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min(x, y, z, ...)
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returns the number with the lowest value
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pow(x, y)
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returns the value of x to the power of y (xy)
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sqrt(x)
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returns the square root of x
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random()
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returns a random number between 0 and 1
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sin(x)
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returns the sine of x (x in radians)
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cos(x)
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returns the cosine of x (x in radians)
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tan(x)
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returns the tangent of an x
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Method
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Meaning
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Units
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getFullYear()
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4-digit year
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2000, 2001, ...
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getMonth()
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month no.
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0 - 11
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getDate()
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dat of month
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0 - 31
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getHours()
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hour no.
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0 - 23
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getMinutes()
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minute no.
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0 - 59
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getSeconds()
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second no.
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0 - 59
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Method
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Description
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concat()
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joins two or more arrays, and returns a copy of the joined array
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indexOf()
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search the array for an element and returns its position
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join()
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joins all elements of an array into a string
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lastIndexOf()
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search the array for an element, starting at the end, and returns its position
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pop()
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removes the last element of an array, and returns that element
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push()
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adds new elements to the end of an array, and returns the new length
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reverse()
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reverses the order of the elements in an array
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shift()
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removes the first element of an array, and returns that element
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sort()
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sorts the elements of an array
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toString()
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converts an array to a string, and returns the result
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valueOf()
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returns the primitive value of an array
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Method
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Description
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toExponential(x)
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converts a number into an exponential notation
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toFixed(x)
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formats a number with x numbers of digits after the decimal point
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toPrecision(x)
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formats a number to x length
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toString()
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converts a Number object to a string
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valueOf()
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returns the primitive value of a Number object
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